Fix simualtion update

src/libs/routes/simulation.js

@@ -137,8 +137,8 @@ simulationApp.put('/:id', passport.authenticate('bearer', { session: false }), (
             return next({err: { msg: 'Simulation not found'}});
         }
 
-        simulation.content = req.body.content | simulation.content;
-        simulation.name = req.body.name | simulation.name;
+        simulation.content = req.body.content || simulation.content;
+        simulation.name = req.body.name || simulation.name;
 
         simulation.save((err) => {
             if(err) {