Better error message if null encryptSalt

Better error message if null encryptSalt

If hit this in a (Karaf 4...) SFT:

[Blueprint Extender: 1] ERROR
org.apache.aries.blueprint.container.ServiceRecipe - Error retrieving
service from ServiceRecipe[name='.component-1']
org.osgi.service.blueprint.container.ComponentDefinitionException: Error
when instantiating bean encryptService of class
org.opendaylight.aaa.encrypt.AAAEncryptionServiceImpl
        at
org.apache.aries.blueprint.container.BeanRecipe.wrapAsCompDefEx(BeanRecipe.java:361)[14:org.apache.aries.blueprint.core:1.6.2]
        at
org.apache.aries.blueprint.container.BeanRecipe.getInstanceFromType(BeanRecipe.java:351)[14:org.apache.aries.blueprint.core:1.6.2]
        at
org.apache.aries.blueprint.container.BeanRecipe.getInstance(BeanRecipe.java:282)[14:org.apache.aries.blueprint.core:1.6.2]
        at
org.apache.aries.blueprint.container.BeanRecipe.internalCreate2(BeanRecipe.java:830)[14:org.apache.aries.blueprint.core:1.6.2]
        at
org.apache.aries.blueprint.container.BeanRecipe.internalCreate(BeanRecipe.java:811)[14:org.apache.aries.blueprint.core:1.6.2]
        at
org.apache.aries.blueprint.di.AbstractRecipe$1.call(AbstractRecipe.java:79)[14:org.apache.aries.blueprint.core:1.6.2]
        at
java.util.concurrent.FutureTask.run(FutureTask.java:266)[:1.8.0_121]
        at
org.apache.aries.blueprint.di.AbstractRecipe.create(AbstractRecipe.java:88)[14:org.apache.aries.blueprint.core:1.6.2]
        at
org.apache.aries.blueprint.di.RefRecipe.internalCreate(RefRecipe.java:62)[14:org.apache.aries.blueprint.core:1.6.2]
        at
org.apache.aries.blueprint.di.AbstractRecipe.create(AbstractRecipe.java:106)[14:org.apache.aries.blueprint.core:1.6.2]
        at
org.apache.aries.blueprint.container.ServiceRecipe.createService(ServiceRecipe.java:285)[14:org.apache.aries.blueprint.core:1.6.2]
        at
org.apache.aries.blueprint.container.ServiceRecipe.internalGetService(ServiceRecipe.java:252)[14:org.apache.aries.blueprint.core:1.6.2]
        at
org.apache.aries.blueprint.container.ServiceRecipe.internalCreate(ServiceRecipe.java:149)[14:org.apache.aries.blueprint.core:1.6.2]
        at
org.apache.aries.blueprint.di.AbstractRecipe$1.call(AbstractRecipe.java:79)[14:org.apache.aries.blueprint.core:1.6.2]
        at
java.util.concurrent.FutureTask.run(FutureTask.java:266)[:1.8.0_121]
        at
org.apache.aries.blueprint.di.AbstractRecipe.create(AbstractRecipe.java:88)[14:org.apache.aries.blueprint.core:1.6.2]
        at
org.apache.aries.blueprint.container.BlueprintRepository.createInstances(BlueprintRepository.java:255)[14:org.apache.aries.blueprint.core:1.6.2]
        at
org.apache.aries.blueprint.container.BlueprintRepository.createAll(BlueprintRepository.java:186)[14:org.apache.aries.blueprint.core:1.6.2]
        at
org.apache.aries.blueprint.container.BlueprintContainerImpl.instantiateEagerComponents(BlueprintContainerImpl.java:724)[14:org.apache.aries.blueprint.core:1.6.2]
        at
org.apache.aries.blueprint.container.BlueprintContainerImpl.doRun(BlueprintContainerImpl.java:411)[14:org.apache.aries.blueprint.core:1.6.2]
        at
org.apache.aries.blueprint.container.BlueprintContainerImpl.run(BlueprintContainerImpl.java:276)[14:org.apache.aries.blueprint.core:1.6.2]
        at
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)[:1.8.0_121]
        at
java.util.concurrent.FutureTask.run(FutureTask.java:266)[:1.8.0_121]
        at
org.apache.aries.blueprint.container.ExecutorServiceWrapper.run(ExecutorServiceWrapper.java:106)[14:org.apache.aries.blueprint.core:1.6.2]
        at
org.apache.aries.blueprint.utils.threading.impl.DiscardableRunnable.run(DiscardableRunnable.java:48)[14:org.apache.aries.blueprint.core:1.6.2]
        at
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)[:1.8.0_121]
        at
java.util.concurrent.FutureTask.run(FutureTask.java:266)[:1.8.0_121]
        at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)[:1.8.0_121]
        at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)[:1.8.0_121]
        at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)[:1.8.0_121]
        at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)[:1.8.0_121]
        at java.lang.Thread.run(Thread.java:745)[:1.8.0_121]
Caused by: java.lang.NullPointerException
        at
java.util.StringTokenizer.<init>(StringTokenizer.java:199)[:1.8.0_121]
        at
java.util.StringTokenizer.<init>(StringTokenizer.java:221)[:1.8.0_121]
        at
org.opendaylight.aaa.encrypt.AAAEncryptionServiceImpl.getEncryptionKeySalt(AAAEncryptionServiceImpl.java:152)[131:org.opendaylight.aaa.encrypt-service:0.5.0.SNAPSHOT]
        at
org.opendaylight.aaa.encrypt.AAAEncryptionServiceImpl.<init>(AAAEncryptionServiceImpl.java:49)[131:org.opendaylight.aaa.encrypt-service:0.5.0.SNAPSHOT]
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
Method)[:1.8.0_121]
        at
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)[:1.8.0_121]
        at
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)[:1.8.0_121]
        at
java.lang.reflect.Constructor.newInstance(Constructor.java:423)[:1.8.0_121]
        at
org.apache.aries.blueprint.utils.ReflectionUtils.newInstance(ReflectionUtils.java:331)[14:org.apache.aries.blueprint.core:1.6.2]
        at
org.apache.aries.blueprint.container.BeanRecipe.newInstance(BeanRecipe.java:984)[14:org.apache.aries.blueprint.core:1.6.2]
        at
org.apache.aries.blueprint.container.BeanRecipe.getInstanceFromType(BeanRecipe.java:349)[14:org.apache.aries.blueprint.core:1.6.2]
        ... 30 more

Change-Id: I37ddaa7a9f9883f7106e68dd7725f7dce50d55d5
Signed-off-by: Michael Vorburger <vorburger@redhat.com>