Using Base URL for graphql requests doesn't work

[kasangasj]

When sending a Graphql request the url parameter in query() functions is nullable but the functions doesn't work without the parameter value submitted, it throws the following Exception:

E/flutter (25033): [ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: Null check operator used on a null value
E/flutter (25033): #0 GetHttpClient._createUri (package:get/get_connect/http/src/http.dart:86:27)
E/flutter (25033): #1 GetHttpClient._requestWithBody (package:get/get_connect/http/src/http.dart:152:17)
E/flutter (25033): #2 GetHttpClient._request (package:get/get_connect/http/src/http.dart:289:12)
E/flutter (25033): #3 GetHttpClient.post. (package:get/get_connect/http/src/http.dart:364:15)
E/flutter (25033): #4 GetHttpClient._performRequest (package:get/get_connect/http/src/http.dart:202:32)
E/flutter (25033): #5 GetHttpClient.post (package:get/get_connect/http/src/http.dart:363:28)
E/flutter (25033): #6 GetConnect.post (package:get/get_connect/connect.dart:169:23)
E/flutter (25033): #7 GetConnect.query (package:get/get_connect/connect.dart:310:25)
E/flutter (25033): #8 EventsProvider.fetchAllItems (package:efatha_church_digital/app/modules/events/providers/events.provider.dart:27:26)
E/flutter (25033): #9 EventsController.onReady (package:efatha_church_digital/app/modules/events/controllers/events.controller.dart:37:14)
E/flutter (25033): #10 DisposableInterface.onInit. (package:get/get_state_manager/src/rx_flutter/rx_disposable.dart:21:44)
E/flutter (25033): #11 SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1386:15)
E/flutter (25033): #12 SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:1322:11)
E/flutter (25033): #13 SchedulerBinding._handleDrawFrame (package:flutter/src/scheduler/binding.dart:1169:5)
E/flutter (25033): #14 _invoke (dart:ui/hooks.dart:312:13)
E/flutter (25033): #15 PlatformDispatcher._drawFrame (dart:ui/platform_dispatcher.dart:399:5)
E/flutter (25033): #16 _drawFrame (dart:ui/hooks.dart:283:31)

**Reproduction code

import 'package:flutter/foundation.dart';
import 'package:get/get.dart';

class EventsProvider extends GetConnect {
  
static const String fetchAllEvents = r"""
query {
	events {
		id
		name
		description
		start_at
		end_at
	}
}
""";

  @override
  void onInit() {
    httpClient.baseUrl = "http://myserver.net/graphql";
    httpClient.timeout = const Duration(seconds: 30);
  }

  Future<void> fetchAllItems() async {
    var response = await query(fetchAllEvents);
    if (kDebugMode) {
      print(response.bodyString);
    }
  }
}

Expected behavior
query(fetchAllEvents) should work without supplying a value for url parameter.

Screenshots
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Flutter Version:
Flutter 3.19.3

Getx Version:
Getx version 4.6.6

Describe on which device you found the bug:
Samsung Galaxy Tab A6

Minimal reproduce code
Provide a minimum reproduction code for the problem