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Fix bug where we raised StopIteration in a generator
This made python 3.7 unhappy
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@ -596,10 +596,13 @@ def _iterate_over_text(tree, *tags_to_ignore):
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# to be returned.
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# to be returned.
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elements = iter([tree])
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elements = iter([tree])
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while True:
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while True:
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el = next(elements)
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el = next(elements, None)
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if el is None:
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return
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if isinstance(el, string_types):
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if isinstance(el, string_types):
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yield el
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yield el
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elif el is not None and el.tag not in tags_to_ignore:
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elif el.tag not in tags_to_ignore:
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# el.text is the text before the first child, so we can immediately
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# el.text is the text before the first child, so we can immediately
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# return it if the text exists.
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# return it if the text exists.
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if el.text:
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if el.text:
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