Description of problem:
Copy+paste with the mouse

Version-Release number of selected component:
Zim-0.56-3.fc17

Additional info:
libreport version: 2.0.16
abrt_version:   2.0.16
cmdline:        /usr/bin/python /usr/bin/zim
kernel:         3.6.3-1.fc17.x86_64

backtrace:
:pageview.py:2055:set_tags:AssertionError: BUG: Tags should have a name
:
:Traceback (most recent call last):
:  File "/usr/lib/python2.7/site-packages/zim/gui/pageview.py", line 4212, in do_delete_range
:    tree = self.buffer.get_parsetree(bounds, raw=True)
:  File "/usr/lib/python2.7/site-packages/zim/gui/pageview.py", line 2082, in get_parsetree
:    set_tags(iter, filter(_is_zim_tag, iter.get_tags()))
:  File "/usr/lib/python2.7/site-packages/zim/gui/pageview.py", line 2055, in set_tags
:    assert attrib['name'], 'BUG: Tags should have a name'
:AssertionError: BUG: Tags should have a name
:
:Local variables in innermost frame:
:builder: <TreeBuilder object at 0x1752f38>
:tags: [<gtk.TextTag object at 0x1a1faf0 (GtkTextTag at 0x1a814c0)>]
:i: 0
:open_tags: []
:self: <TextBuffer object at 0x19a02d0 (zim+gui+pageview+TextBuffer at 0x204b490)>
:iter: <GtkTextIter at 0x1a8acf0>
:raw: True
:tag: <gtk.TextTag object at 0x1a1faf0 (GtkTextTag at 0x1a814c0)>
:t: 'tag'
:attrib: {'name': u''}
:continue_attrib: {}