Allow empty <extensions>
element in XML configuration
#5419
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In Symfony, we'd like to have new projects start with a
phpunit.xml.dist
file that contains an empty<extensions>
tag, see symfony/recipes#1215 for a bit of context. TL;DR, this empty tag would be a very useful hooks for automatically enabling extensions when they're installed with flex.Many tags already have thisminOccurs="0"
so I added it to the few tags that don't. Might be useful for similar reasons.I hope this change can make it as a bug fix 🙏 (let me know if I should/can target 8.5 instead)