Fix lobby copy paste for empty model units

[SJuliez]

Fixes #5740
hopefully this time. Empty models weren't considered properly. Also, the StringTokenizer skipped empty tokens.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 29.06%. Comparing base (f7b39ab) to head (25f0675).
Report is 22 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5806      +/-   ##
============================================
- Coverage     29.06%   29.06%   -0.01%     
  Complexity    13907    13907              
============================================
  Files          2507     2507              
  Lines        266333   266330       -3     
  Branches      47605    47610       +5     
============================================
- Hits          77421    77396      -25     
- Misses       184987   185008      +21     
- Partials       3925     3926       +1     

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