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** Branch linked: lp:openobject-client-kde

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https://bugs.launchpad.net/bugs/683169

Title:
  Graph fails if date field is empty (patch included)

Status in Qt/KDE OpenObject Client:
  Fix Released

Bug description:
  Hello!

If you have a graph with a dates on the x axis and some of the records have an empty date, the bar chart fails.
Example view:
                 <graph string="Sales by Products" type="bar">
                     <field name="date"/>
                     <field name="price_total" operator="+"/>
					 <field group="True" name="product_id"/>
                 </graph>
Traceback (most recent call last):
  File "Koo/Dialogs/KooMainWindow.py", line 782, in callChildView
    res = wid.handlers[action]()
  File "Koo/Dialogs/FormWidget.py", line 278, in switchView
    self.screen.switchView( viewType )
  File "Koo/Screen/Screen.py", line 481, in switchView
    self.display()
  File "Koo/Screen/Screen.py", line 826, in display
    self.currentView().display(self.currentRecord(), self.group)
  File "Koo/View/Chart/ChartView.py", line 53, in display
    self.widget.display(models)
  File "Koo/View/Chart/ChartGraphicsView.py", line 131, in display
    date = time.strptime(m.value(x), DT_FORMAT)
  File "/usr/lib/python2.6/_strptime.py", line 454, in _strptime_time
    return _strptime(data_string, format)[0]
  File "/usr/lib/python2.6/_strptime.py", line 322, in _strptime
    found = format_regex.match(data_string)
TypeError: expected string or buffer