Improve parse error handling

[akx]

• Log the Pyparsing explain() context for a parse failure
• Don't fail entire parsing if a wildcard value is not parseable

Refs https://github.com/adieyal/sd-dynamic-prompts/issues/572

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 97.31%. Comparing base (1d2a8e9) to head (7031ebc). Report is 3 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #126      +/-   ##
==========================================
+ Coverage   97.29%   97.31%   +0.01%     
==========================================
  Files          77       77              
  Lines        3364     3388      +24     
==========================================
+ Hits         3273     3297      +24     
  Misses         91       91              

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