private Function getDestFunction(VTAssociation association) {

		Address address = association.getDestinationAddress();
		return destinationProgram.getFunctionManager().getFunctionAt(address);
	}
Method to determine if the given src or dest addresses have existing association 
@param source the source address
@param dest the destination address
@return true if there are any existin associations, false if none
Ghidra/Features/VersionTracking/src/main/java/ghidra/feature/vt/gui/actions/AutoVersionTrackingTask.java