fix deprecation warning for at least php 8.1.6 #237
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running
vendor/bin/phpuniton at least php version 8.1.6 results in multiplewarnings that state:
Deprecated: ltrim(): Passing null to parameter #1 ($string) of type string is deprecated in .../Coders/Model/Model.php on line 505
add a conditional to check the argument for null before using it to build parentClass