GtkTreeModel.get_iter requires a tree path as its argument

Bug reported by Fedora 18 user:

https://bugzilla.redhat.com/show_bug.cgi?id=918336

Version-Release number of selected component:
decibel-audio-player-1.08-6.fc18

Additional info:
cmdline: python /usr/share/decibel-audio-player/src/decibel-audio-player.py
executable: /usr/share/decibel-audio-player/src/decibel-audio-player.py
kernel: 3.8.1-201.fc18.x86_64
uid: 1000

Truncated backtrace:
extListview.py:431:setItem:TypeError: GtkTreeModel.get_iter requires a tree path as its argument

Traceback (most recent call last):
  File "/usr/share/decibel-audio-player/src/modules/__init__.py", line 282, in __dispatch
    self.handlers[msg](**params)
  File "/usr/share/decibel-audio-player/src/modules/Tracklist.py", line 95, in <lambda>
    consts.MSG_EVT_TRACK_ENDED_ERROR: lambda: self.onTrackEnded(True),
  File "/usr/share/decibel-audio-player/src/modules/Tracklist.py", line 438, in onTrackEnded
    self.list.setItem(currIdx, ROW_ICO, icons.errorMenuIcon())
  File "/usr/share/decibel-audio-player/src/gui/extListview.py", line 431, in setItem
    self.store.set_value(self.store.get_iter(rowIndex), colIndex, value)
TypeError: GtkTreeModel.get_iter requires a tree path as its argument

Local variables in innermost frame:
rowIndex: None
colIndex: 0
self: <ExtListView object at 0x185ebe0 (GtkTreeView at 0x7fbb1c004e20)>
value: <gtk.gdk.Pixbuf object at 0x1866640 (GdkPixbuf at 0x26bf720)>