RackTables: master 6eb70f01

Author Committer Branch Timestamp Parent
infrastation infrastation master 2017-06-06 11:27:54 master 837ad4ae
Changeset refine delivery of rack thumb images

A read-only RackTables instance would display an error image instead of
the thumbnail image for any rack that has invalidated thumbnail cache.
This change makes it deliver the thumbnail even if the attempted cache
update failed because of insufficient database permissions.

* RTDBTableAccessDenied: a new exception class
* convertPDOException(): add a respective case block for the error code
* dispatchMiniRackThumbRequest(): use the above for its REPLACE and
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