Prevent NPE in Sirius if a model element doesn't have an eResource #214
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Signed-off-by: Didier Vojtisek <didier.vojtisek@inria.fr>
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Description
In some graphical representation we may sometime get DNode model element without eResource (I don't really know why 😞 ), when used in GEMOC simulation,this raises NPE when it tries to get the permission to edit/create/delete the element
cf. org.eclipse.gemoc.executionframework.extensions.sirius.modelloaderebugPermissionAuthority
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