This fixes an exception when trying to run :open-editor with a comment field
with QtWebKit:
16:37:51 DEBUG webelem webelem:is_editable:238 Checking if element is editable: <qutebrowser.browser.webkit.webkitelem.WebKitElement html='<div id="writer9997095275-writer" class="writer selectable no-lub put-art-here ui-droppable empty" style="min-height: 146px; width: 1169px;" contenteditable="true"></div>'>
16:37:51 ERROR misc crashsignal:exception_hook:205 Uncaught exception
Traceback (most recent call last):
File "/home/florian/proj/qutebrowser/git/qutebrowser/app.py", line 882, in eventFilter
return handler(event)
File "/home/florian/proj/qutebrowser/git/qutebrowser/app.py", line 842, in _handle_key_event
return man.eventFilter(event)
File "/home/florian/proj/qutebrowser/git/qutebrowser/keyinput/modeman.py", line 337, in eventFilter
return self._eventFilter_keypress(event)
File "/home/florian/proj/qutebrowser/git/qutebrowser/keyinput/modeman.py", line 168, in _eventFilter_keypress
handled = parser.handle(event)
File "/home/florian/proj/qutebrowser/git/qutebrowser/keyinput/basekeyparser.py", line 307, in handle
handled = self._handle_special_key(e)
File "/home/florian/proj/qutebrowser/git/qutebrowser/keyinput/basekeyparser.py", line 136, in _handle_special_key
self.execute(cmdstr, self.Type.special, count)
File "/home/florian/proj/qutebrowser/git/qutebrowser/keyinput/keyparser.py", line 44, in execute
self._commandrunner.run(cmdstr, count)
File "/home/florian/proj/qutebrowser/git/qutebrowser/commands/runners.py", line 275, in run
result.cmd.run(self._win_id, args, count=count)
File "/home/florian/proj/qutebrowser/git/qutebrowser/commands/command.py", line 525, in run
self.handler(*posargs, **kwargs)
File "/home/florian/proj/qutebrowser/git/qutebrowser/browser/commands.py", line 1600, in open_editor
tab.elements.find_focused(self._open_editor_cb)
File "/home/florian/proj/qutebrowser/git/qutebrowser/browser/webkit/webkittab.py", line 589, in find_focused
callback(webkitelem.WebKitElement(elem, tab=self._tab))
File "/home/florian/proj/qutebrowser/git/qutebrowser/browser/commands.py", line 1580, in _open_editor_cb
text = elem.value()
File "/home/florian/proj/qutebrowser/git/qutebrowser/browser/webkit/webkitelem.py", line 116, in value
assert isinstance(val, (int, float, str)), val
AssertionError: None
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