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[bugfix] empty From date filter NoneType error (#3633)
Error "AttributeError: 'NoneType' object has no attribute 'split'" is fired.
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@ -158,10 +158,11 @@ class BaseViz(object):
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until = form_data.get("until", "now")
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# Backward compatibility hack
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since_words = since.split(' ')
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grains = ['days', 'years', 'hours', 'day', 'year', 'weeks']
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if (len(since_words) == 2 and since_words[1] in grains):
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since += ' ago'
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if since:
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since_words = since.split(' ')
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grains = ['days', 'years', 'hours', 'day', 'year', 'weeks']
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if (len(since_words) == 2 and since_words[1] in grains):
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since += ' ago'
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from_dttm = utils.parse_human_datetime(since)
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