ExitTool and DoNothing

My way of Exiting tool in case or error, also another sub that basically does nothing.
Two (or 4?) of my standard small subs that can standardize the work like...
Exiting sub safely without leaving anything behind, like Calculation or ScreenUpdating.
And DoNothing can be helpful by linking objects in Excel spreadsheet to it, instead of allowing users to selecting them and modifying them.