Merge pull request #18030 from genoher/feature/Show-Error-Message-When-Fail-Open-Modal

Show error message when open modal fails in mvc.

framework/src/Volo.Abp.AspNetCore.Mvc.UI.Theme.Shared/wwwroot/libs/abp/aspnetcore-mvc-ui-theme-shared/bootstrap/modal-manager.js

@@ -144,7 +144,8 @@ $.validator.defaults.ignore = ''; //TODO: Would be better if we can apply only f
                 _createContainer(_modalId)
                     .load(options.viewUrl, $.param(argsWithoutFunc), function (response, status, xhr) {
                         if (status === "error") {
-                            //TODO: Handle!
+                            var responseJSON = xhr.responseJSON ? xhr.responseJSON : JSON.parse(xhr.responseText);
+                            abp.ajax.showError(responseJSON.error ? responseJSON.error : abp.ajax.defaultError);
                             return;
                         };