Crash when exporting settings

[Jonathan Corwin]

O/S: Windows 7
Version: trunk 2.1r2434

File -> Export -> Settings.
Choose location and Enter a file name.
Gives crash dialog:
Traceback (most recent call last):
  File "C:\Users\Jonathan\Documents\projects\openlp\trunk\openlp\core\ui\mainwindow.py", line 981, in on_settings_export_item_clicked
    key_value = settings.value(section_key)
  File "C:\Users\Jonathan\Documents\projects\openlp\trunk\openlp\core\common\settings.py", line 437, in value
    default_value = Settings.__default_settings__[key]
KeyError: 'custom/custom/display footer'

[Tomas Groth (tomasgroth)]

I can't reproduce this on linux, maybe it's a windows only problem...

[Tim Bentley (trb143)]

custom/custom/display footer looks interesting. Is't there an extra custom

[Jonathan Corwin (j-corwin)]

Looking in the registry I have most of the settings directly under 'custom' where they should be, but I do also have display footer duplicated under 'custom/custom'. Bear in mind that my PC has probably had most OpenLP's installed on it, so I guess this setting crept in temporarily at one point, even if no longer valid. So if I have it, then others may as well.
(Is there some code that cleans up old redundant/invalid settings?)

However I did just delete the settings from the registry, started again, and the settings exported fine.