fixes #990

[avonville]

Fixes minify still logging when debug is not checked.

Testing

1. Flush cache
2. Go to the site and monitor wp-content/cache/log/000000/minify.log
3. The log file should not have any new entries.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Project coverage is 0.89%. Comparing base (a9d7c0b) to head (7a8dc50).

Files with missing lines	Patch %	Lines
Minify_MinifiedFileRequestHandler.php	0.00%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             master    #991      +/-   ##
===========================================
- Coverage      0.89%   0.89%   -0.01%     
- Complexity    19697   19698       +1     
===========================================
  Files           679     679              
  Lines         99411   99413       +2     
===========================================
  Hits            893     893              
- Misses        98518   98520       +2     

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