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bpo-32179: Fix handling of empty email address in header parsing #4644

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bpo-32179: Fix handling of empty email address in header parsing #4644

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2 changes: 1 addition & 1 deletion Lib/email/_header_value_parser.py
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Original file line number Diff line number Diff line change
Expand Up @@ -980,7 +980,7 @@ def local_part(self):
if (last_is_tl and tok.token_type == 'dot' and
last[-1].token_type == 'cfws'):
res[-1] = TokenList(last[:-1])
is_tl = isinstance(tok, TokenList)
is_tl = isinstance(tok, TokenList) and len(tok)
if (is_tl and last.token_type == 'dot' and
tok[0].token_type == 'cfws'):
res.append(TokenList(tok[1:]))
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