sccp: Be less verbose on failed parsing messages

We could signal a Notification with the message that could not
be parsed. The actual printNl with the message didn't work either.

SCCPHandler.st

@@ -584,8 +584,7 @@ deadlocks should not occur.'>
         [
             sccp := self class dissectMSG: aMsg.
         ] on: Exception do: [:e |
-            e logException: 'Failed to parse message' area: #sccp.
-            aMsg toMessageOrByteArray printNl.
+            self logNotice: 'Failed to parse message' area: #sccp.
             ^ false
         ].