replying with ERROR instead of abort (e.g. on AmSipDialog::reply_error no non-existing request)

git-svn-id: http://svn.berlios.de/svnroot/repos/sems/trunk@1812 8eb893ce-cfd4-0310-b710-fb5ebe64c474

core/sip/trans_layer.cpp

@@ -115,7 +115,11 @@ int trans_layer::send_reply(trans_ticket* tt,
     //  - Accept
 
     assert(tt);
-    assert(tt->_bucket && tt->_t);
+
+    if (!tt->_bucket || !tt->_t) {
+	ERROR("Invalid transaction ticket\n");
+	return -1;
+    }
 
     trans_bucket* bucket = tt->_bucket;
     sip_trans*    t = tt->_t;