don't add empty realizations to main module files

[orichters]

• if a realization is deleted in the repo, often the input folder remains in the clones, containing the input files that are not version-controlled
• update_modules_embedding then adds that empty realization to module.gms, but warns it cannot be used
• After this PR: Warn that it cannot be used, and therefore don't add it to module.gms
• added a small test that let me find several errors:
  • modelpath was not used consistently, often assuming .
  • if the first line of main.gms contains an include, the script ran infinitely

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (9a604ba) 35.63% compared to head (bf38bab) 41.34%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #78      +/-   ##
==========================================
+ Coverage   35.63%   41.34%   +5.70%     
==========================================
  Files          51       51              
  Lines        1664     1669       +5     
==========================================
+ Hits          593      690      +97     
+ Misses       1071      979      -92     

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[orichters]

@tscheypidi: This has been lingering around since two month now, do you wanna have a look?

[tscheypidi]

@orichters sorry for having looked at it earlier and thanks for the reminder. This one somehow slipped through my to-do-list. Changes look good, you just have to fix the merge conflicts.

[orichters]

@orichters sorry for having looked at it earlier and thanks for the reminder. This one somehow slipped through my to-do-list. Changes look good, you just have to fix the merge conflicts.

All good, wasn't urgent at all.