Fix(BaseElementExtension): Update permission check to fall-through with 'null' so other extensions can control the canView/canEdit/canDelete/canCreate permissions.
Fix(BaseElementExtension): Update permission check to fall-through with 'null' so other extensions can control the canView/canEdit/canDelete/canCreate permissions.

dnadesign/silverstripe-elemental,mhssmnn/silverstripe-elemental,dnadesign/silverstripe-elemental