datawidget.py: raise AttributeError manually if item is graph, was not always raised; maybe problem of #52
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@ -350,6 +350,9 @@ class DataTree(QtWidgets.QTreeWidget):
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_id = item.data(0, QtCore.Qt.UserRole)
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if _id in ids:
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try:
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if item.parent() is None:
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raise AttributeError
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idx = item.parent().indexOfChild(item)
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item.parent().takeChild(idx)
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if _id in self._checked_sets:
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