BSC_Tests: Make as_Tguard() more robust (don't abort after RESET)

Change-Id: Ia5a39d372c1b7ec8267446f2762aabc600667775
diff --git a/bsc/BSC_Tests.ttcn b/bsc/BSC_Tests.ttcn
index 2e48e0b..aa8150a 100644
--- a/bsc/BSC_Tests.ttcn
+++ b/bsc/BSC_Tests.ttcn
@@ -163,6 +163,7 @@
 	[] BSSAP.receive(tr_BSSAP_UNITDATA_ind(?, ?, tr_BSSMAP_Reset)) -> value ud_ind {
 		BSSAP.send(ts_BSSAP_UNITDATA_req(ud_ind.callingAddress, ud_ind.calledAddress,
 			   ts_BSSMAP_ResetAck));
+		repeat;
 		}
 }