The result cache should still work if there are no composer or baseline files.

[frankdekker]

Type: bugfix
Originated from: #1011
Breaking change: no

The result cache will generate cache data with 5 keys. One of those keys is baselineHash, which can be null. However I used
isset (instead of array_keys_exist), to check if all keys were present. Ive changed this to array_keys_exist instead.

Added testcase for the original problem.

Thanks @mvoelker for the investigation of the problem.

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (247f84e) 92.40% compared to head (91e3022) 92.39%.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1037      +/-   ##
============================================
- Coverage     92.40%   92.39%   -0.01%     
- Complexity     1221     1225       +4     
============================================
  Files           110      110              
  Lines          3343     3342       -1     
============================================
- Hits           3089     3088       -1     
  Misses          254      254              

Files	Coverage Δ
...c/main/php/PHPMD/Cache/ResultCacheStateFactory.php	100.00% <100.00%> (ø)

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