bsc: inter-BSC incoming HO in with empty SCCP CR

Test inter-BSC incoming HO where the Handover Request message is not
included in the initial SCCP N-Connect, but follows in a separate DT1.

Related: SYS#5864
Depends: I535c791fa01e99a2226392eb05f676ba6c3cc16e (osmo-bsc)
Change-Id: I6732153cdd0d529bfaf0925387e765f3403a756b
diff --git a/library/RAN_Emulation.ttcnpp b/library/RAN_Emulation.ttcnpp
index 295876e..d87ee9c 100644
--- a/library/RAN_Emulation.ttcnpp
+++ b/library/RAN_Emulation.ttcnpp
@@ -439,9 +439,9 @@
 type record BSSAP_Conn_Req {
 	SCCP_PAR_Address	addr_peer,
 	SCCP_PAR_Address	addr_own,
-	PDU_BSSAP		bssap
+	PDU_BSSAP		bssap optional
 }
-template BSSAP_Conn_Req ts_BSSAP_Conn_Req(SCCP_PAR_Address peer, SCCP_PAR_Address own, PDU_BSSAP bssap) := {
+template BSSAP_Conn_Req ts_BSSAP_Conn_Req(SCCP_PAR_Address peer, SCCP_PAR_Address own, template (omit) PDU_BSSAP bssap) := {
 	addr_peer := peer,
 	addr_own := own,
 	bssap := bssap