[LYN-4288] Adding error page if resource mapping tool has invalid setup (#1219)

Gems/AWSCore/Code/Tools/ResourceMappingTool/controller/error_controller.py

@@ -0,0 +1,33 @@
+"""
+All or portions of this file Copyright (c) Amazon.com, Inc. or its affiliates or
+its licensors.
+
+For complete copyright and license terms please see the LICENSE at the root of this
+distribution (the "License"). All use of this software is governed by the License,
+or, if provided, by the license below or the license accompanying this file. Do not
+remove or modify any license notices. This file is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+"""
+
+from PySide2.QtCore import (QCoreApplication, QObject)
+
+from manager.view_manager import ViewManager
+from view.error_page import ErrorPage
+
+
+class ErrorController(QObject):
+    """
+    ErrorPage Controller
+    """
+    def __init__(self) -> None:
+        super(ErrorController, self).__init__()
+        # Initialize manager references
+        self._view_manager: ViewManager = ViewManager.get_instance()
+        # Initialize view references
+        self._error_page: ErrorPage = self._view_manager.get_error_page()
+
+    def _ok(self) -> None:
+        QCoreApplication.instance().quit()
+
+    def setup(self) -> None:
+        self._error_page.ok_button.clicked.connect(self._ok)