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[Jonathan Corwin <j@xxxxxxxxxxxx>]

** Changed in: openlp
    Milestone: None => 1.9.5

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https://bugs.launchpad.net/bugs/716843

Title:
  Cannot black screen on startup

Status in OpenLP - Worship Presentation Software:
  Fix Released

Bug description:
  **OpenLP Bug Report**
  Version: 1.9.2-bzr987

  --- Details of the Exception. ---

  TB1 - Just pressed black screen after loading OpenLP i.e. without an item live.
  TB2 - Clear the exception window from TB1 and unblack the screen. You get TB1 again after closing TB2 just for good measure.
  TB3 - You get this on startup if you dared to close OpenLP with a black screen.

   --- Exception Traceback ---
  Traceback (most recent call last):
    File "/home/jt/projects/openlp/openlp/trivialfixes/openlp/core/ui/slidecontroller.py", line 761, in onBlankDisplay
      self.updatePreview()
    File "/home/jt/projects/openlp/openlp/trivialfixes/openlp/core/ui/slidecontroller.py", line 880, in updatePreview
      self.serviceItem.is_capable(ItemCapabilities.ProvidesOwnDisplay):
  AttributeError: 'NoneType' object has no attribute 'is_capable'

  
  Traceback (most recent call last):
    File "/home/jt/projects/openlp/openlp/trivialfixes/openlp/core/ui/slidecontroller.py", line 880, in updatePreview
      self.serviceItem.is_capable(ItemCapabilities.ProvidesOwnDisplay):
  AttributeError: 'NoneType' object has no attribute 'is_capable'

  
  Traceback (most recent call last):
    File "/home/jt/projects/openlp/openlp/trivialfixes/openlp/core/ui/mainwindow.py", line 674, in blankCheck
      self.liveController.mainDisplaySetBackground()
    File "/home/jt/projects/openlp/openlp/trivialfixes/openlp/core/ui/slidecontroller.py", line 727, in mainDisplaySetBackground
      self.onBlankDisplay(True)
    File "/home/jt/projects/openlp/openlp/trivialfixes/openlp/core/ui/slidecontroller.py", line 761, in onBlankDisplay
      self.updatePreview()
    File "/home/jt/projects/openlp/openlp/trivialfixes/openlp/core/ui/slidecontroller.py", line 880, in updatePreview
      self.serviceItem.is_capable(ItemCapabilities.ProvidesOwnDisplay):
  AttributeError: 'NoneType' object has no attribute 'is_capable'

  --- System information ---
  Platform: Linux-2.6.35.10-74.fc14.i686-i686-with-fedora-14-Laughlin

  --- Library Versions ---
  Python: 2.7.0
  Qt4: 4.7.1
  Phonon: 4.4.3
  PyQt4: 4.7.4
  SQLAlchemy: 0.6.6
  BeautifulSoup: 3.0.8.1
  lxml: 2.2.8
  Chardet: 2.0.1
  PyEnchant: 1.3.1
  PySQLite: -