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[Tim Bentley <883975@xxxxxxxxxxxxxxxxxx>]

** Branch linked: lp:~trb143/openlp/bug-883975

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https://bugs.launchpad.net/bugs/883975

Title:
  Crash when sending an alert while the initial screen is displayed.

Status in OpenLP - Worship Presentation Software:
  Fix Committed

Bug description:
  Hello,

  trunk r1788

  1) Start OpenLP
  2) Hide the screen
  3) Press F7 to display an alert message

  Result:
  Traceback (most recent call last):
    File "/home/andreas/Projekte/openlp/trunk/openlp/plugins/alerts/forms/alertform.py", line 84, in onDisplayClicked
      self.triggerAlert(unicode(self.alertTextEdit.text()))
    File "/home/andreas/Projekte/openlp/trunk/openlp/plugins/alerts/forms/alertform.py", line 198, in triggerAlert
      self.plugin.alertsmanager.displayAlert(text)
    File "/home/andreas/Projekte/openlp/trunk/openlp/plugins/alerts/lib/alertsmanager.py", line 77, in displayAlert
      self.generateAlert()
    File "/home/andreas/Projekte/openlp/trunk/openlp/plugins/alerts/lib/alertsmanager.py", line 88, in generateAlert
      self.parent().liveController.display.alert(text, alertTab.location)
    File "/home/andreas/Projekte/openlp/trunk/openlp/core/ui/maindisplay.py", line 242, in alert
      alert_height = int(height.toString())
  ValueError: invalid literal for int() with base 10: ''

  The reason is that at the time of building the html for the initial
  screen the plugins are not loaded OR the css/html is just not
  considered.

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