Fix a PHP 8.1 deprecated use of strlen with a NULL argument in commit parser master
Summary: With PHP 8.1+ it is not possible to import a commit if the commiter field is not properly defined Indeed, if the committer is not properly defined, strlen(null) is called, causing a deprecation warning, elevated to exception. Using strlen() to check string validity is deprecated since PHP 8.1. Phorge adopts phutil_nonempty_string() as a replacement. Fix T15629 Test Plan: - Push a commit to an observed subversion repository - Import it via the phorge/bin/repository reparse COMMIT_ID --importing - The commit should be properly imported and available in Diffusion Reviewers: O1 Blessed Committers, Sten, valerio.bozzolan Reviewed By: O1 Blessed Committers, Sten, valerio.bozzolan Subscribers: Sten, tobiaswiese, valerio.bozzolan, Matthew, Cigaryno Maniphest Tasks: T15629 Differential Revision: https://we.phorge.it/D25423