made CodeExplorerCommandMenuItem always enabled.

Author: retailcoder

RetailCoder.VBE/UI/Command/MenuItems/CodeExplorerCommandMenuItem.cs

@@ -1,3 +1,4 @@
+using Rubberduck.Parsing.VBA;
 using Rubberduck.UI.Command.MenuItems.ParentMenus;
 
 namespace Rubberduck.UI.Command.MenuItems
@@ -9,6 +10,8 @@ public CodeExplorerCommandMenuItem(CommandBase command)
         {
         }
 
+        public override bool EvaluateCanExecute(RubberduckParserState state) => true;
+
         public override string Key => "RubberduckMenu_CodeExplorer";
         public override int DisplayOrder => (int)NavigationMenuItemDisplayOrder.CodeExplorer;
     }

RetailCoder.VBE/UI/Command/MenuItems/CommandMenuItemBase.cs

@@ -47,7 +47,7 @@ public virtual Func<string> ToolTipText
         /// <remarks>Returns <c>true</c> if not overridden.</remarks>
         public virtual bool EvaluateCanExecute(RubberduckParserState state)
         {
-            return state != null && _command.CanExecute(state);
+            return state != null && (_command?.CanExecute(state) ?? false);
         }
 
         public virtual ButtonStyle ButtonStyle => ButtonStyle.IconAndCaption;