small bugfix

[abolix]

fixed "FileNotFoundError: [Errno 2] No such file or directory: 'python' " on ubuntu 20.04

[coveralls]

Coverage decreased (-0.3%) to 97.706% when pulling e1fdf55 on abolix:patch-1 into 5f825c0 on nephila:develop.

[codecov]

Codecov Report

Merging #382 (d163a53) into develop (5f825c0) will decrease coverage by 1.32%.
The diff coverage is 50.00%.

@@             Coverage Diff             @@
##           develop     #382      +/-   ##
===========================================
- Coverage    94.44%   93.11%   -1.33%     
===========================================
  Files            7        9       +2     
  Lines          612      654      +42     
  Branches       128      135       +7     
===========================================
+ Hits           578      609      +31     
- Misses          10       15       +5     
- Partials        24       30       +6     

Flag	Coverage Δ
unittests	93.11% <50.00%> (-1.33%)	⬇️

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Impacted Files	Coverage Δ
djangocms_installer/install/__init__.py	91.30% <50.00%> (-4.05%)	⬇️
djangocms_installer/__init__.py	100.00% <0.00%> (ø)
djangocms_installer/main.py	75.00% <0.00%> (ø)

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