Error earlier for missing lint_message

[MichaelChirico]

Nice to have this error early, currently lazy evaluation hides it until lrun time.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 50.00000% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 98.14%. Comparing base (713fb0b) to head (1c14890).

❗ Current head 1c14890 differs from pull request most recent head 1d73d08. Consider uploading reports for the commit 1d73d08 to get more accurate results

Files	Patch %	Lines
R/make_linter_from_xpath.R	50.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2541      +/-   ##
==========================================
- Coverage   98.16%   98.14%   -0.02%     
==========================================
  Files         125      125              
  Lines        5715     5717       +2     
==========================================
+ Hits         5610     5611       +1     
- Misses        105      106       +1     

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