Polished up false positive fix

Conflicts:
	src/com/mebigfatguy/fbcontrib/detect/HangingExecutors.java
Added null check

Findbugs suggested it.
Merge branch 'refs/heads/fixHESFalsePositives'

Conflicts:
	src/com/mebigfatguy/fbcontrib/detect/HangingExecutors.java