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[Launchpad Bug Tracker <883414@xxxxxxxxxxxxxxxxxx>]

** Branch linked: lp:~trb143/openlp/bug-875798

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https://bugs.launchpad.net/bugs/883414

Title:
  Traceback when displaying an alert when the display screen is closed

Status in OpenLP - Worship Presentation Software:
  Fix Committed

Bug description:
  Hello,

  windows xp, build 1787

  1) Make sure the live display is closed. You can send a song live (does not matter), but you need to close it with ESC.
  2) Press F7 to display an alert.
  3) Send the alert.

  However, the alert is still displayed.

  Result:
  Traceback (most recent call last):
    File "D:\OpenLP_Code\trunk\build\pyi.win32\OpenLP\outPYZ1.pyz\openlp.plugins.alerts.forms.alertform", line 84, in onDisplayClicked
    File "D:\OpenLP_Code\trunk\build\pyi.win32\OpenLP\outPYZ1.pyz\openlp.plugins.alerts.forms.alertform", line 198, in triggerAlert
    File "D:\OpenLP_Code\trunk\build\pyi.win32\OpenLP\outPYZ1.pyz\openlp.plugins.alerts.lib.alertsmanager", line 77, in displayAlert
    File "D:\OpenLP_Code\trunk\build\pyi.win32\OpenLP\outPYZ1.pyz\openlp.plugins.alerts.lib.alertsmanager", line 88, in generateAlert
    File "D:\OpenLP_Code\trunk\build\pyi.win32\OpenLP\outPYZ1.pyz\openlp.core.ui.maindisplay", line 244, in alert
  AttributeError: 'MainDisplay' object has no attribute 'alertTab'

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