Fix for Reload With(out) Extensions not working

In Brackets 1.14.1 a browser reload failed (menu items Debug | Reload With(out) Extensions).
Rejecting the `_disableCache()` promise when no remote debugging port is found, will fix this.

Author: SietseB

src/document/DocumentCommandHandlers.js

@@ -1665,6 +1665,8 @@ define(function (require, exports, module) {
                             // In case of an error
                             _socket.onerror = result.reject;
                         });
+                } else {
+                    result.reject();
                 }
             });
         }