remove print from detached HEAD

[brainelectronics]

Using the branch property of HistoryWalker in collector.py would print HEAD is detached: ... in case the HEAD is detached during a pull request build. This could lead to errors while creating a changelog with --dry-run and passing the output to a supposed JSON file, being finally unable to parse it as with that detached HEAD output it's not a JSON anymore.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.33%. Comparing base (3369d04) to head (ad27898).

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Additional details and impacted files

@@           Coverage Diff           @@
##             main      #30   +/-   ##
=======================================
  Coverage   83.33%   83.33%           
=======================================
  Files           1        1           
  Lines          36       36           
  Branches        8        8           
=======================================
  Hits           30       30           
  Misses          4        4           
  Partials        2        2           

Flag	Coverage Δ
unittests	83.33% <ø> (ø)

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[brainelectronics]

LGTMyself