Do not add duplicate search entries

[benoit74]

Fix #107

This issue fixes the scraper failure so that at least we achieve to produce a valid ZIM. It does not fixes the problem itself which is that we miss hierarchy information for these places. I will open a distinct issue on that topic

[codecov]

Codecov Report

❌ Patch coverage is 0% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 35.33%. Comparing base (355112a) to head (5827993).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
scraper/src/maps2zim/processor.py	0.00%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #108      +/-   ##
==========================================
- Coverage   35.60%   35.33%   -0.28%     
==========================================
  Files          11       11              
  Lines        1025     1033       +8     
  Branches      145      147       +2     
==========================================
  Hits          365      365              
- Misses        644      652       +8     
  Partials       16       16              

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