Do not fail during reconfiguration if there is no such container

src/apptask.js

@@ -344,7 +344,7 @@ function stopContainer(app, callback) {
     };
 
     container.stop(options, function (error) {
-        if (error && error.statusCode !== 304) return callback(new Error('Error starting container:' + error));
+        if (error && (error.statusCode !== 304 || error.statusCode !== 404)) return callback(new Error('Error stopping container:' + error));
 
         return callback(null);
     });