Fixed NPE in JUnit5 helper if docker is not availabled

[alex268]

No description provided.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 60.15%. Comparing base (4324f5f) to head (e357e3c).

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #506      +/-   ##
============================================
- Coverage     60.17%   60.15%   -0.03%     
+ Complexity     2265     2264       -1     
============================================
  Files           328      328              
  Lines         13436    13436              
  Branches       1343     1343              
============================================
- Hits           8085     8082       -3     
- Misses         4744     4747       +3     
  Partials        607      607              

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