create_entity to fail if entity exists
check ourselves, do not rely on sql integrity
fix accessing entity and policy holdings
Handle IntegrityError in create_entity call.
It should be checked also for the other calls
fix Holding entity argument in set_quota
fix set_quota to create holding
actually check for import/export limits
fix another missing continue after reject append
fix model name in initial_data fixture
callpoint: create_entity: continue in case owner entity does not exist
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