enhancement in main script so that it does not crash when it runs for 0 (only...

enhancement in main script so that it does not crash when it runs for 0 (only warning) ans trace can be viewed

dream/simulation/LineGenerationJSON.py

@@ -1296,7 +1296,7 @@ def main(argv=[], input_data=None):
                 endList.append(exit.timeLastEntityLeft)
   
             # identify the time of the last event
-            if G.env.now!=0 and G.env.now==float('inf'):    #do not let G.maxSimTime=0 so that there will be no crash
+            if float(max(endList))!=0 and G.env.now==float('inf'):    #do not let G.maxSimTime=0 so that there will be no crash
                 G.maxSimTime=float(max(endList))
             else:
                 print "simulation ran for 0 time, something may have gone wrong"