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Fix PHP 8.1 "strlen(null)" exception on Diffusion repo URIs page after repo…

Description

Fix PHP 8.1 "strlen(null)" exception on Diffusion repo URIs page after repo creation

Summary:
strlen() was used in Phabricator to check if a generic value is a non-empty string.
This behavior is deprecated since PHP 8.1. Phorge adopts phutil_nonempty_string() as a replacement.

Note: this may highlight other absurd input values that might be worth correcting
instead of just ignoring. If phutil_nonempty_string() throws an exception in your
instance, report it to Phorge to evaluate and fix that specific corner case.

ERROR 8192: strlen(): Passing null to parameter #1 ($string) of type string is deprecated at [/var/www/html/phorge/phorge/src/applications/repository/storage/PhabricatorRepository.php:348]

Closes T15658

Test Plan: Create an empty new Git repository, go to its URIs management page.

Reviewers: O1 Blessed Committers, speck

Reviewed By: O1 Blessed Committers, speck

Subscribers: tobiaswiese, valerio.bozzolan, Matthew, Cigaryno

Maniphest Tasks: T15658

Differential Revision: https://we.phorge.it/D25454