Fix for archive task

[dmromanov]

See #944

[codecov]

Codecov Report

Merging #945 into master will decrease coverage by <.01%.
The diff coverage is 0%.

@@             Coverage Diff             @@
##             master    #945      +/-   ##
===========================================
- Coverage      44.9%   44.9%   -0.01%     
  Complexity     9920    9920              
===========================================
  Files           499     499              
  Lines         24043   24044       +1     
===========================================
  Hits          10796   10796              
- Misses        13247   13248       +1

Impacted Files	Coverage Δ	Complexity Δ
classes/phing/tasks/ext/TarTask.php	0% <0%> (ø)	39 <0> (ø)	⬇️

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[siad007]

@dmromanov Thanks for this contribution.