fix(socket_notifier): _tryOn() did not cover all cases

When JSON content is a List type, the catch syntax in `_tryOn()` method will fail to catch the error.
deleted `on Exception` will fix the bug.

@@ -72,7 +72,7 @@ class SocketNotifier {
       if (_onEvents!.containsKey(event)) {
         _onEvents![event]!(data);
       }
-    } on Exception catch (_) {
+    } catch (_) {
       return;
     }
   }