ddl: fix fetching invalid configuration #309
Merged
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Before this patch, in case there is a sharding key record in _ddl_sharding_key for a non-existing space (for example, if ddl space wasn't properly dropped) and sharding info needs to be updated, any crud request will fail with "attempt to index a nil value" error. This patch fixes the behavior and adds a log warning if ddl configuration is invalid.
I didn't forget about
Closes #308