csv export doesn't work

[anonymous]

When trying to export tickets using the CSV function, it returns:

AttributeError: 'list' object has no attribute 'keys'

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How to Reproduce

While doing a GET operation on /hours, Trac issued an internal error.

(please provide additional details here)

Request parameters:

{'format': u'csv'}

User agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.8) Gecko/20100722 Firefox/3.6.8

System Information

System information not available

Enabled Plugins

Plugin information not available

Python Traceback

Traceback (most recent call last):
  File "build/bdist.linux-x86_64/egg/trac/web/main.py", line 511, in _dispatch_request
    dispatcher.dispatch(req)
  File "build/bdist.linux-x86_64/egg/trac/web/main.py", line 237, in dispatch
    resp = chosen_handler.process_request(req)
  File "/usr/lib/python2.5/site-packages/TracHoursPlugin-0.5.2-py2.5.egg/trachours/hours.py", line 234, in process_request
    return self.process_timeline(req)
  File "/usr/lib/python2.5/site-packages/TracHoursPlugin-0.5.2-py2.5.egg/trachours/hours.py", line 509, in process_timeline
    return self.display_html(req, query)
  File "/usr/lib/python2.5/site-packages/TracHoursPlugin-0.5.2-py2.5.egg/trachours/hours.py", line 834, in display_html
    self.queryhours2csv(req, data)
  File "/usr/lib/python2.5/site-packages/TracHoursPlugin-0.5.2-py2.5.egg/trachours/hours.py", line 986, in queryhours2csv
    for constraint in sorted(data['constraints'].keys()):
AttributeError: 'list' object has no attribute 'keys'