Fix replace with empty document (#227)

[bwaldvogel]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 87.50000% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 95.23%. Comparing base (9e8ec5e) to head (3cbfa03).

Files	Patch %	Lines
...ldvogel/mongo/backend/AbstractMongoCollection.java	66.66%	0 Missing and 1 partial ⚠️

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Additional details and impacted files

@@            Coverage Diff            @@
##               main     #229   +/-   ##
=========================================
  Coverage     95.23%   95.23%           
- Complexity     3292     3293    +1     
=========================================
  Files           184      184           
  Lines         14112    14117    +5     
  Branches       1326     1326           
=========================================
+ Hits          13440    13445    +5     
  Misses          444      444           
  Partials        228      228           

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