rackerlabs/deuce — pull request #222 by TheSriram (2014-11-13 22:28:58+00:00)
Title: fix: get orphaned blocks

- make sure that 'metadata_block_id' is not None, before making any
queries to the metadata databases. In the case, its None, it means
the Block is orphaned in storage, set both x-ref-modified and
x-ref-count to be 0