[2185] Fix ownership of constraints created inside requirement

[pcdavid]

Bug: #2185
Signed-off-by: Pierre-Charles David pierre-charles.david@obeo.fr

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[AxelRICHARD]

I'm not sure about that. I think it should probably be an explicit call to caseFeature or just return null to let the switch continue its process and fallback to caseFeature.