Fix null selected Locale

Author: MaksymHernets

Assets/AutoTranslate/Editor/AutoTranslate_EditorWindow.cs

@@ -118,7 +118,7 @@ void OnGUI()
             EditorGUILayout.EndVertical();
             EditorGUILayout.BeginVertical(GUILayout.ExpandHeight(true));
             _dropdownLanguages.Draw();
-            if ( translator.ValidateLocale(_selectedLocale.Identifier.Code) == false)
+            if ( _selectedLocale != null && translator.ValidateLocale(_selectedLocale.Identifier.Code) == false)
             {
                 EditorGUILayout.HelpBox(translator.GetNameService() + " service does not support some dialects of languages, the choice of language will be changed to the generally accepted.", MessageType.Warning);
             }

Assets/AutoTranslate/GUIPro/CheckListGUI.cs

@@ -12,7 +12,7 @@ public class CheckListGUI : BaseGUI
         public int MinWidth = 100;
         public int Height;
         public int MinHeight = 100;
-        public Color BackColor = Color.white;
+        public Color BackColor = Color.gray;
 
 		private GUIStyle CheckListStyle;
 		private Texture2D texture2D;