Adding tests for empty preconditions in rules.

[cmungall]

Made jsonschema and owl consistent in their interpretation of this

[codecov]

Codecov Report

Attention: 6 lines in your changes are missing coverage. Please review.

Comparison is base (55cc87f) 80.13% compared to head (c88d381) 80.16%.
Report is 4 commits behind head on main.

Files	Patch %	Lines
linkml/generators/owlgen.py	72.72%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1926      +/-   ##
==========================================
+ Coverage   80.13%   80.16%   +0.03%     
==========================================
  Files         100      100              
  Lines       11503    11531      +28     
  Branches     2903     2912       +9     
==========================================
+ Hits         9218     9244      +26     
- Misses       1732     1740       +8     
+ Partials      553      547       -6     

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