Added test if self.model_filter is None
self.model_filter will be None if no list was ever loaded in the Client, so listview.create_column_state would fail.
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@ -307,9 +307,10 @@ class ListView:
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position = index
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break
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sort = None
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sort_id, order = self.model_filter.get_sort_column_id()
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if self.get_column_name(sort_id) == column.get_title():
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sort = sort_id
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if self.model_filter:
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sort_id, order = self.model_filter.get_sort_column_id()
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if self.get_column_name(sort_id) == column.get_title():
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sort = sort_id
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return ListViewColumnState(column.get_title(), position,
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column.get_width(), column.get_visible(),
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