Flint: Friday merge regression

This have to be fixed before the release.

Traceback (most recent call last):
  File "/users/valls/workspace/bliss.git/bliss/flint/manager/manager.py", line 422, in __aliveScanDiscovered
    self.updateScanAndPlots(scan, plots)
  File "/users/valls/workspace/bliss.git/bliss/flint/manager/manager.py", line 478, in updateScanAndPlots
    self.updateWidgetsWithPlots(scan, plots, useDefaultPlot, defaultPlot)
  File "/users/valls/workspace/bliss.git/bliss/flint/manager/manager.py", line 499, in updateWidgetsWithPlots
    self.updateWidgetWithPlot(widget, scan, plotModel, useDefaultPlot)
  File "/users/valls/workspace/bliss.git/bliss/flint/manager/manager.py", line 576, in updateWidgetWithPlot
    reusePreviousPlotItems(previousPlotModel, plotModel, scan)
  File "/users/valls/workspace/bliss.git/bliss/flint/manager/manager.py", line 553, in reusePreviousPlotItems
    previousWidgetPlot, plotModel, scan
  File "/users/valls/workspace/bliss.git/bliss/flint/helper/model_helper.py", line 702, in copyItemsFromChannelNames
    copyItemConfig(sourceItem, item)
  File "/users/valls/workspace/bliss.git/bliss/flint/helper/model_helper.py", line 737, in copyItemConfig
    "Both items must have the same type. Found %s" % type(destinationItem)
TypeError: Both items must have the same type. Found <class 'bliss.flint.model.plot_item_model.CurveItem'>