Fix zimwriterfs and missing magic file.

[mgautierfr]

Fix #371

[codecov]

Codecov Report

Attention: 16 lines in your changes are missing coverage. Please review.

Comparison is base (e4440d1) 27.72% compared to head (109afe5) 27.58%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #374      +/-   ##
==========================================
- Coverage   27.72%   27.58%   -0.15%     
==========================================
  Files          26       26              
  Lines        2528     2541      +13     
  Branches     1349     1350       +1     
==========================================
  Hits          701      701              
- Misses       1346     1359      +13     
  Partials      481      481              

Files	Coverage Δ
src/zimwriterfs/zimwriterfs.cpp	0.00% <0.00%> (ø)

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[rgaudin]

LGTM but I notice that parse_args was inside a try block and is not anymore.

[mgautierfr]

Yes. But for me it should not be in. I suspect a too "large" try block.
The try/catch is to catch error from the zim creation. parse_args has no reason to throw a exception.