Iuh_Emulation: Avoid sending events to HNBAP if socket is not connected

This should hopefully fix HNB_Tests errors showing up in jenkins after
the test finishes:
Iuh_Emulation.ttcn:203 Dynamic test case error: Port HNBAP has neither connections nor mappings. Message cannot be sent on it.

Change-Id: Ide201425e81dcfe2fd395d820bdcbd74f5415ef5
1 file changed