#174 - FSes that are only transitively referenced cannot be serialized (#179)

[reckart]

• Initial fix did only work for the first fs without xmiID, but as soon as there would be two FSes with missing ids, it broke
• Extended the test
• Implemented an alternative fix that optionally sets the missing IDs while scanning the CAS for FSes thus also avoiding scanning the CAS twice during serialization

[codecov[bot]]

Codecov Report

Merging #182 (9caa301) into main (9cdbd73) will increase coverage by 0.02%. The diff coverage is 95.83%.

@@            Coverage Diff             @@
##             main     #182      +/-   ##
==========================================
+ Coverage   97.37%   97.39%   +0.02%     
==========================================
  Files           9        9              
  Lines        1940     1955      +15     
==========================================
+ Hits         1889     1904      +15     
  Misses         51       51              

Impacted Files	Coverage Δ
cassis/xmi.py	96.47% <ø> (-0.04%)	:arrow_down:
cassis/cas.py	96.83% <90.00%> (+0.09%)	:arrow_up:
tests/test_cas.py	100.00% <100.00%> (ø)
tests/test_xmi.py	100.00% <100.00%> (ø)

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