Fix cases of MultiServerClient not being able to handle GraphQL being disabled

tests/Tgstation.Server.Tests/Live/MultiServerClient.cs

@@ -28,7 +28,7 @@ namespace Tgstation.Server.Tests.Live
 		public ValueTask DisposeAsync()
 			=> ValueTaskExtensions.WhenAll(
 				RestClient.DisposeAsync(),
-				GraphQLClient.DisposeAsync());
+				GraphQLClient?.DisposeAsync() ?? ValueTask.CompletedTask);
 
 		public ValueTask Execute(
 			Func<IRestServerClient, ValueTask> restAction,
@@ -48,6 +48,11 @@ namespace Tgstation.Server.Tests.Live
 			where TGraphQLResult : class
 		{
 			var restTask = restAction(RestClient);
+			if (!UseGraphQL)
+			{
+				return (await restTask, null);
+			}
+
 			var graphQLResult = await GraphQLClient.RunOperation(graphQLAction, cancellationToken);
 
 			graphQLResult.EnsureNoErrors();
@@ -60,6 +65,6 @@ namespace Tgstation.Server.Tests.Live
 		}
 
 		public ValueTask<IDisposable> Subscribe<TResultData>(Func<IGraphQLClient, IObservable<IOperationResult<TResultData>>> operationExecutor, IObserver<IOperationResult<TResultData>> observer, CancellationToken cancellationToken) where TResultData : class
-			=> GraphQLClient.Subscribe(operationExecutor, observer, cancellationToken);
+			=> GraphQLClient?.Subscribe(operationExecutor, observer, cancellationToken) ?? ValueTask.FromResult<IDisposable>(new CancellationTokenSource());
 	}
 }

tests/Tgstation.Server.Tests/Live/TestLiveServer.cs

@@ -1930,11 +1930,13 @@ namespace Tgstation.Server.Tests.Live
 						password,
 						cancellationToken: cancellationToken);
 					using var cts = CancellationTokenSource.CreateLinkedTokenSource(cancellationToken);
-					graphQLClientTask = graphQLClientFactory.CreateFromLogin(
-						url,
-						username,
-						password,
-						cancellationToken: cts.Token);
+					graphQLClientTask = MultiServerClient.UseGraphQL
+						? graphQLClientFactory.CreateFromLogin(
+							url,
+							username,
+							password,
+							cancellationToken: cts.Token)
+						: ValueTask.FromResult<IAuthenticatedGraphQLServerClient>(null);
 
 					IRestServerClient restClient;
 					try

tests/Tgstation.Server.Tests/Live/UsersTest.cs

@@ -48,6 +48,9 @@ namespace Tgstation.Server.Tests.Live
 
 			await TestPagination(cancellationToken);
 
+			if (!MultiServerClient.UseGraphQL)
+				return;
+
 			Assert.IsFalse(observer.Completed);
 			Assert.AreEqual(0U, observer.ErrorCount);