stop asserting if we have a controller listening for circuit events

and we're offline so we fail to make a circuit and it tries to notify
us about the zero-length circuit.


svn:r4600

src/or/circuitbuild.c

@@ -79,7 +79,6 @@ circuit_list_path(circuit_t *circ, int verbose)
   char buf[128];
   char *s;
   tor_assert(CIRCUIT_IS_ORIGIN(circ));
-  tor_assert(circ->cpath);
 
   elements = smartlist_create();