odlparent TestBundleDiag throws NPE

In some cases, TestBundleDiag throws an NPE at line 130 (probably due to the fact that the bundle identified by the serviceReference has been destroyed). Null checks should be added.

Stack trace:
org.opendaylight.odlparent.featuretest.SingleFeatureTest
13:05:36 installFeatureCatchAndLog(org.opendaylight.odlparent.featuretest.SingleFeatureTest)[repoUrl: file:/w/workspace/aaa-verify-nitrogen-mvn33-openjdk8/features/authn/features4-aaa/target/feature/feature.xml, Feature: odl-aaa-cert 0.6.0.SNAPSHOT] Time elapsed: 30.387 sec <<< ERROR!
13:05:36 java.lang.NullPointerException
13:05:36 at org.opendaylight.odlparent.bundles4test.TestBundleDiag.logOSGiServices(TestBundleDiag.java:130)
13:05:36 at org.opendaylight.odlparent.bundles4test.TestBundleDiag.logBundleDiagInfos(TestBundleDiag.java:105)
13:05:36 at org.opendaylight.odlparent.bundles4test.TestBundleDiag.checkBundleDiagInfos(TestBundleDiag.java:84)
13:05:36 at org.opendaylight.odlparent.bundles4test.TestBundleDiag.checkBundleDiagInfos(TestBundleDiag.java:49)
13:05:36 at org.opendaylight.odlparent.featuretest.SingleFeatureTest.installFeature(SingleFeatureTest.java:387)
13:05:36 at org.opendaylight.odlparent.featuretest.SingleFeatureTest.installFeatureCatchAndLog(SingleFeatureTest.java:338)
13:05:36 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
13:05:36 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
13:05:36 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
13:05:36 at java.lang.reflect.Method.invoke(Method.java:498)
13:05:36 at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
13:05:36 at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
13:05:36 at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
13:05:36 at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
13:05:36 at org.junit.internal.runners.statements.FailOnTimeout$CallableStatement.call(FailOnTimeout.java:298)
13:05:36 at org.junit.internal.runners.statements.FailOnTimeout$CallableStatement.call(FailOnTimeout.java:292)
13:05:36 at java.util.concurrent.FutureTask.run(FutureTask.java:266)
13:05:36 at java.lang.Thread.run(Thread.java:745)