Small fix to inifile/arg parsing in cosmic-pop for METISSE

[d-maclean]

Hello,

Currently, cosmic-pop will throw a TypeError under the following specific circumstances:

• the stellar_engine is metisse
• the inifile value for m2_min is commented out (default) or None (default value when uncommented)

This exception is related to how m2_min and m1_min are parsed to set the truncation limits for the IMF. For users who use qmin instead this can cause a bit of a headache. I changed the indentation levels here to avoid these checks if m2_min is not passed or is set to None.

The behavior where an exception is thrown if you pass both qmin and m2_min is preserved.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.14%. Comparing base (8772c07) to head (ced4b32).
⚠️ Report is 170 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff              @@
##           develop     #797       +/-   ##
============================================
- Coverage    86.91%   76.14%   -10.77%     
============================================
  Files           40       58       +18     
  Lines        25542    28169     +2627     
  Branches         0      985      +985     
============================================
- Hits         22198    21448      -750     
- Misses        3344     6416     +3072     
- Partials         0      305      +305     

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