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Description of problem:
  This is a regression of bz#1209576 [2]

Version-Release number of selected component (if applicable):
  docker-1.7.1-115.el7

How reproducible:
  Hardly

Steps to Reproduce:
1. use docker - pull images, build new ones, start containers
2. try to remove any image by its ID (docker rmi 54bdc57505af)

Actual results:
  Image isn't removed with this error:
  Error response from daemon: could not find image: Prefix can't be empty

Expected results:
  Image is removed.

Additional info:
  Already fixed in docker-1.6.2-8.el7 with a patch [1] merged upstream. The patch did not make it pass a rebase to 1.7.

[1] https://github.com/docker/docker/commit/71a499022904e1da074ded3e1ed874c1b75ccf23
[2] https://bugzilla.redhat.com/show_bug.cgi?id=1209576

Here's a PR with backported fix for 1.7: https://github.com/rhatdan/docker/pull/115

I update the rhel7-1.7 branch with this fix.  Did we miss the window to get this into the next RHEL release?

https://github.com/docker/docker/issues/12487
Is discussing this issue.

Fixed in docker-1.8.2