Delete operation should only delete attributes which exist in the dictionary #661
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This PR provides an additional check before deleting certain attributes in file parent dictionaries which may be omitted in the output of
blockdumps
API. In particular, the newly deployed Go server does not provideparent_file_id
in its output, since this information is redundant (i.e. it cannot be used in migration process since these ids have no sense in destination database, and moreover python DBSMigration code does not use this information either). As such, I address this issue in this PR to make it compatible with new Go-based DBS server. We may need it during transition period when we would like to runside by side both DBSMigration servers.