Bug: Improper call of sim.stop

Signed-off-by: SystemsPurge <[email protected]>

villas/controller/components/simulators/dpsim.py

@@ -99,7 +99,9 @@ def stop(self):
         if self._state == 'running':
             self.logger.info('Stopping simulation...')
 
-            if self.sim and self.sim.stop() is None:
+            if self.sim:
+                if self.current < self.count:
+                    self.sim.stop()
                 self.change_state('stopped')
                 self.sim = None
                 self.current = 0