Fixed a Null Pointer Exception

Run time system found with Stp interface without
corresponding bridge port. So check the existance
of the bridge port is necessary
fix another JDK 7 issue, OPENNMS-NMS112JDK17-TEST-32
Merge branch '1.12'

Conflicts:
	opennms-services/src/main/java/org/opennms/netmgt/linkd/AbstractQueryManager.java