arcanist

Fix strlen(): Passing null to parameter #1 ($string) of type string is deprecated

Fix for strlen(): Passing null to parameter #1 ($string) of type string is deprecated

Fix for RuntimeException: strtolower(): Passing null to parameter #1 ($string) of type string is deprecated in src/lint/linter/ArcanistScriptAndRegexLinter.php

Remove call to PHP "utf8_decode()" in "phutil_utf8_strlen()"

Correct a PHP8 compatibility issue when running "arc diff" with no active branch