simulator.resume() should resume even if no listeners active

The experiment developer has full control over the number of active
listeners.  simulator.resume() therefore should resume simulation even if
it won't ever return.

git-svn-id: https://www4.informatik.uni-erlangen.de/i4svn/danceos/trunk/devel/fail@1574 8c4709b5-6ec9-48aa-a5cd-a96041d1645a

src/core/sal/SimulatorController.cc

@@ -21,8 +21,6 @@ bool SimulatorController::addListener(BaseListener* li)
 
 BaseListener* SimulatorController::resume(void)
 {
-	if (!hasListeners())
-		return NULL;
 	m_Flows.resume();
 	assert(m_LstList.getLastFired() != NULL &&
 		   "FATAL ERROR: getLastFired() expected to be non-NULL!");