handle empty content before domdocument creation #15364
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In PHP 7.4 at least it seems like DOMDocument does not handle empty HTML content well.
From CLI:
Uncaught ValueError: DOMDocument::loadHTML(): Argument 1 ($source) must not be empty in php shell code:1
See https://github.com/glpi-project/glpi/actions/runs/5761634677/job/15619847811