Description of problem:
I tried to submit a copr build with 

copr-cli build inkscape-unstable 'http://ryanlerch.fedorapeople.org/copr-srpms/inkscape/inkscape.src.rpm'

and this error appeared:

Build was added to inkscape-unstable.
Traceback (most recent call last):
  File "/usr/bin/copr-cli", line 9, in <module>
    load_entry_point('copr-cli==0.2.0', 'console_scripts', 'copr-cli')()
  File "/usr/lib/python2.7/site-packages/copr_cli/main.py", line 127, in main
    arg.func(arg)
  File "/usr/lib/python2.7/site-packages/copr_cli/main.py", line 22, in action_build
    args.memory, args.timeout, not args.nowait)
  File "/usr/lib/python2.7/site-packages/copr_cli/subcommands.py", line 203, in build
    print("Build ID: {0}".format(output['id']))
KeyError: 'id'

Version-Release number of selected component:
copr-cli-1.26-1.fc20

Additional info:
reporter:       libreport-2.2.0
cmdline:        /usr/bin/python2 /usr/bin/copr-cli build inkscape-unstable http://ryanlerch.fedorapeople.org/copr-srpms/inkscape/inkscape-0.91-20140414bzr13283.fc20.src.rpm
executable:     /usr/bin/copr-cli
kernel:         3.13.8-200.fc20.x86_64
runlevel:       N 5
type:           Python
uid:            1000

Truncated backtrace:
subcommands.py:203:build:KeyError: 'id'

Traceback (most recent call last):
  File "/usr/bin/copr-cli", line 9, in <module>
    load_entry_point('copr-cli==0.2.0', 'console_scripts', 'copr-cli')()
  File "/usr/lib/python2.7/site-packages/copr_cli/main.py", line 127, in main
    arg.func(arg)
  File "/usr/lib/python2.7/site-packages/copr_cli/main.py", line 22, in action_build
    args.memory, args.timeout, not args.nowait)
  File "/usr/lib/python2.7/site-packages/copr_cli/subcommands.py", line 203, in build
    print("Build ID: {0}".format(output['id']))
KeyError: 'id'

Local variables in innermost frame:
copr_api_url: 'http://copr-fe.cloud.fedoraproject.org/api'
URL: 'http://copr-fe.cloud.fedoraproject.org/api/coprs/ryanlerch/inkscape-unstable/new_build/'
pkgs: ['http://ryanlerch.fedorapeople.org/copr-srpms/inkscape/inkscape-0.91-20140414bzr13283.fc20.src.rpm']
req: <Response [200]>
copr: 'inkscape-unstable'
user: {'username': '************', 'token': '************', 'login': '*********'}
timeout: None
memory: None
output: {u'output': u'ok', u'message': u'Build was added to inkscape-unstable.', u'ids': [9161]}
data: {'pkgs': 'http://ryanlerch.fedorapeople.org/copr-srpms/inkscape/inkscape-0.91-20140414bzr13283.fc20.src.rpm', 'timeout': None, 'memory': None}
wait: True