Fix: Issue with typing null monomial
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@ -34,6 +34,17 @@ def multiply_filter(left, right):
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:param right: MO
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:returns: MO if it is a special case, nothing other wise
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"""
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try:
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if left == 0:
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return left
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except TypeError:
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pass
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try:
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if right == 0:
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return right
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except TypeError:
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pass
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try:
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if left == 1:
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return right
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