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[Launchpad Bug Tracker <1534306@xxxxxxxxxxxxxxxxxx>]

** Branch linked: lp:openlp

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https://bugs.launchpad.net/bugs/1534306

Title:
  Empty song-titles causes tracebacks on update from 2.0 to 2.2

Status in OpenLP:
  In Progress

Bug description:
  Empty song-titles causes tracebacks on update from 2.0 to 2.2.

  This basically prevents users from using songs OpenLP 2.2 after
  upgrading.

  The traceback:

  Traceback (most recent call last):
  File "C:\Program Files (x86)\OpenLP\plugins\songs\songsplugin.py", line 206, in on_song_import_item_clicked
  self.media_item.on_import_click()
  File "D:\OpenLP_Development\OpenLP_Code\2.2\openlp\plugins\songs\lib\mediaitem.py", line 298, in on_import_click
  File "D:\OpenLP_Development\OpenLP_Code\2.2\openlp\core\common\registry.py", line 137, in execute
  File "D:\OpenLP_Development\OpenLP_Code\2.2\openlp\plugins\songs\lib\mediaitem.py", line 219, in on_song_list_load
  File "D:\OpenLP_Development\OpenLP_Code\2.2\openlp\plugins\songs\lib\mediaitem.py", line 165, in on_search_text_button_clicked
  File "D:\OpenLP_Development\OpenLP_Code\2.2\openlp\plugins\songs\lib\mediaitem.py", line 206, in search_entire
  File "D:\OpenLP_Development\OpenLP_Code\2.2\openlp\core\lib\db.py", line 372, in get_all_objects
  File "c:\Python33\lib\site-packages\sqlalchemy\orm\query.py", line 2292, in all
  File "c:\Python33\lib\site-packages\sqlalchemy\orm\loading.py", line 72, in instances
  File "c:\Python33\lib\site-packages\sqlalchemy\orm\loading.py", line 72, in <listcomp>
  File "c:\Python33\lib\site-packages\sqlalchemy\orm\loading.py", line 455, in _instance
  File "c:\Python33\lib\site-packages\sqlalchemy\event\attr.py", line 257, in __call__
  File "c:\Python33\lib\site-packages\sqlalchemy\orm\mapper.py", line 2650, in _event_on_load
  File "D:\OpenLP_Development\OpenLP_Code\2.2\openlp\plugins\songs\lib\db.py", line 134, in init_on_load
  File "D:\OpenLP_Development\OpenLP_Code\2.2\openlp\core\utils\__init__.py", line 532, in get_natural_key
  IndexError: string index out of range

  An example DB can be found attached to this support ticket:
  http://support.openlp.org/scp/tickets.php?id=3250

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