do not throw exception for update notification if experiment has not started

src/python/dm/__init__.py

-__version__ = "0.2 (2015.07.07)"
+__version__ = "0.5 (2015.11.06)"

src/python/dm/ds_web_service/service/impl/experimentSessionControllerImpl.py

@@ -51,9 +51,8 @@ class ExperimentSessionControllerImpl(DmObjectManager):
 
     def updateExperiment(self, name):
         experiment = self.experimentDbApi.getExperimentWithUsers(name)
-        if experiment.get('startDate') is None:
-            raise InvalidRequest('Experiment %s has not been started.' % name)
-        ExperimentManager.getInstance().updateExperimentGroupUsers(experiment)
+        if experiment.get('startDate') is not None:
+            ExperimentManager.getInstance().updateExperimentGroupUsers(experiment)
         return experiment
 
     def stopExperiment(self, name):