Hitting preview when comment is empty breaks trac

[anonymous]

Steps to reproduce: select a ticket, select "reassign ticket to", enter a name, hit "preview" instead of submit.

Result:

 Trac detected an internal error:

  'NoneType' object has no attribute 'splitlines'

Traceback:

 Traceback (most recent call last):
  File "/usr/lib/python2.2/site-packages/trac/core.py", line 522, in cgi_start
    real_cgi_start()
  File "/usr/lib/python2.2/site-packages/trac/core.py", line 517, in real_cgi_start
    dispatch_request(path_info, args, req, env)
  File "/usr/lib/python2.2/site-packages/trac/core.py", line 432, in dispatch_request
    module.run()
  File "/usr/lib/python2.2/site-packages/trac/Module.py", line 45, in run
    self.render()
  File "/usr/lib/python2.2/site-packages/trac/Ticket.py", line 442, in render
    self.req.hdf, self.env))
  File "/usr/lib/python2.2/site-packages/trac/WikiFormatter.py", line 536, in wiki_to_html
    Formatter(hdf, env, absurls).format(wikitext, out)
  File "/usr/lib/python2.2/site-packages/trac/WikiFormatter.py", line 490, in format
    for line in text.splitlines():
AttributeError: 'NoneType' object has no attribute 'splitlines'

[anonymous]

On further investigation it seems that this will happen whenever the comment field is left empty and preview is selected. I've updated the summary to reflect this.

[Matthew Good <matt-good.net>]

Well, I'm changing the version to "devel", as WikiFormatter?.py isn't in milestone:0.7.1 and changing the component to wiki, as that's where the problem seems to originate from.

However, I'm using the trunk from [909] and I can't reproduce this error. I'm using mod_python, though so the problem could be cgi specific.

[jonas]

Fixed in [912].

[jonas]

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