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[David Stansberry <694148@xxxxxxxxxxxxxxxxxx>]

Little bit more. If you try to rename/edit an existing theme, openlp
produces the error as mentioned above but leaves theme in theme manager
untouched for now. Closing openlp and re opening it, the theme that was
tried to be renamed/edited is now not in the theme manager, deleted.

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https://bugs.launchpad.net/bugs/694148

Title:
  importing theme produces errors

Status in OpenLP - Worship Presentation Software:
  New

Bug description:
  OpenLP 1.9.3 build bzr1163
Importing new themes produces the following error

Traceback (most recent call last):
  File "/usr/lib/pymodules/python2.6/openlp/core/ui/thememanager.py", line 378, in onImportTheme
    self.unzipTheme(file, self.path)
  File "/usr/lib/pymodules/python2.6/openlp/core/ui/thememanager.py", line 516, in unzipTheme
    self.generateAndSaveImage(dir, themename, theme)
  File "/usr/lib/pymodules/python2.6/openlp/core/ui/thememanager.py", line 699, in generateAndSaveImage
    frame = self.generateImage(theme)
  File "/usr/lib/pymodules/python2.6/openlp/core/ui/thememanager.py", line 721, in generateImage
    return self.parent.renderManager.generate_preview(themeData, forcePage)
  File "/usr/lib/pymodules/python2.6/openlp/core/lib/rendermanager.py", line 217, in generate_preview
    self.image_manager.del_image(self.theme_data.theme_name)
AttributeError: 'NoneType' object has no attribute 'theme_name'

This Theme did import before. also and this may be related in trying to rename an installed theme, that produce an error also as follows

Traceback (most recent call last):
  File "/usr/lib/pymodules/python2.6/openlp/core/ui/thememanager.py", line 157, in contextMenu
    self.onRenameTheme()
  File "/usr/lib/pymodules/python2.6/openlp/core/ui/thememanager.py", line 236, in onRenameTheme
    self.cloneThemeData(oldThemeData, newThemeName)
  File "/usr/lib/pymodules/python2.6/openlp/core/ui/thememanager.py", line 264, in cloneThemeData
    self.saveTheme(themeData, saveFrom, saveTo)
  File "/usr/lib/pymodules/python2.6/openlp/core/ui/thememanager.py", line 665, in saveTheme
    self.generateAndSaveImage(self.path, name, theme)
  File "/usr/lib/pymodules/python2.6/openlp/core/ui/thememanager.py", line 699, in generateAndSaveImage
    frame = self.generateImage(theme)
  File "/usr/lib/pymodules/python2.6/openlp/core/ui/thememanager.py", line 721, in generateImage
    return self.parent.renderManager.generate_preview(themeData, forcePage)
  File "/usr/lib/pymodules/python2.6/openlp/core/lib/rendermanager.py", line 217, in generate_preview
    self.image_manager.del_image(self.theme_data.theme_name)
AttributeError: 'NoneType' object has no attribute 'theme_name'