Fixed processing of empty data in fbuffer class.

[MusicScience37]

This pull request fixes #1164 and adds a unit test for the fix.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.07%. Comparing base (e18398a) to head (6bd9a57).
Report is 12 commits behind head on cpp_master.

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Additional details and impacted files

@@             Coverage Diff             @@
##           cpp_master    #1165   +/-   ##
===========================================
  Coverage       86.07%   86.07%           
===========================================
  Files              80       80           
  Lines            5392     5393    +1     
  Branches          503      499    -4     
===========================================
+ Hits             4641     4642    +1     
  Misses            751      751           

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[redboltz]

Thank you very much!