#5984 - Prevent 0 CF bridges in generated maps

[SJuliez]

This uses a default CF of 40 in generated maps when random map settings (or some other thing) would otherwise lead to 0 CF bridges.

Fixes #5984

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 29.09%. Comparing base (036eda5) to head (f4de423).
Report is 15 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #6026   +/-   ##
=========================================
  Coverage     29.09%   29.09%           
- Complexity    13972    13973    +1     
=========================================
  Files          2580     2580           
  Lines        267172   267174    +2     
  Branches      47710    47711    +1     
=========================================
+ Hits          77744    77745    +1     
- Misses       185530   185532    +2     
+ Partials       3898     3897    -1     

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