OutputControl:Files incorrectly produces "unused object" warning

[shorowit]

Issue overview

When you include an OutputControl:Files object in your IDF, you get an incorrect warning from EnergyPlus:

   ************* There are 1 unused objects in input.
   ************* Use Output:Diagnostics,DisplayUnusedObjects; to see them.

If I use the Output:Diagnostics,DisplayUnusedObjects object:

   ** Warning ** The following lines are "Unused Objects".  These objects are in the input
   **   ~~~   **  file but are never obtained by the simulation and therefore are NOT used.
   **   ~~~   **  Only the first unused named object of an object class is shown.  Use Output:Diagnostics,DisplayAllWarnings; to see all.
   **   ~~~   **  See InputOutputReference document for more details.
   ************* Object=OutputControl:Files=OutputControl:Files 1

Example file to reproduce:
in.idf.txt

Details

Some additional details for this issue (if relevant):

• Windows 10
• EnergyPlus v9.5

Checklist

Add to this list or remove from it as applicable. This is a simple templated set of guidelines.

• Defect file added: https://github.com/NREL/EnergyPlusDevSupport/blob/master/DefectFiles/8000s/8999/in.idf
• Ticket added to Pivotal for defect (development team task)
• Pull request created (the pull request will have additional tasks related to reviewing changes that fix this defect)