Use De Morgan's laws to simplify an expression. (#1531)
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@ -608,9 +608,9 @@ class EmbeddedDocumentField(BaseField):
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"""
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def __init__(self, document_type, **kwargs):
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if (
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not isinstance(document_type, six.string_types) and
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not issubclass(document_type, EmbeddedDocument)
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if not (
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isinstance(document_type, six.string_types) or
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issubclass(document_type, EmbeddedDocument)
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):
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self.error('Invalid embedded document class provided to an '
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'EmbeddedDocumentField')
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