gnodet opened a new pull request, #13510:
URL: https://github.com/apache/maven/pull/13510

   Backport of #13269 to `maven-4.0.x`.
   
   - Print usage (same output as `mvn -h`) and exit 0 when `mvn` is invoked 
with no arguments and no POM is found
   - Clean up -f/--file missing-file error message
   - Fix double error message when -f points to a non-existent POM file
   - Fix shell scripts (mvn, mvn.cmd) not to exit when -f argument does not 
exist; add [ERROR] prefix to Windows cmd error messages
   - Catch IllegalArgumentException in ProjectModelResolver and wrap as 
ModelBuilderException
   - Style: collapse duplicate catch blocks into multi-catch


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