bug noted by Jerome in Exit fixed. Got to see if it is better to return 0,...

bug noted by Jerome in Exit fixed. Got to see if it is better to return 0, None, or nothing in cases where there are no exits and lifespan and takt_time have no meaning

dream/simulation/Exit.py

@@ -212,8 +212,9 @@ class Exit(CoreObject):
             json['id'] = str(self.id)
             json['results'] = {}
             json['results']['throughput']=self.numOfExits        
-            json['results']['lifespan']=((self.totalLifespan)/self.numOfExits)/G.Base
-            json['results']['takt_time']=((self.totalTaktTime)/self.numOfExits)/G.Base
+            json['results']['lifespan']=self.Lifespan[0]
+            json['results']['takt_time']=self.TaktTime[0]            
+                
         else: #if we had multiple replications we output confidence intervals to excel
                 #for some outputs the results may be the same for each run (eg model is stochastic but failures fixed
                 #so failurePortion will be exactly the same in each run). That will give 0 variability and errors.