api: use empty strings for None labels (#35448)
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@ -301,7 +301,7 @@ class VisualizationJSONView(generics.GenericAPIView):
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}
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elif len(drilldowns) == 1:
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table = list(visualization.data())
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axis_data = [x[0]['value'].strip() for x in table]
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axis_data = [(x[0]['value'] or '').strip() for x in table]
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data = [x[1]['value'] for x in table]
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if visualization.drilldown_x:
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axis = {'x_labels': axis_data}
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