[New-bugs-announce] [issue43090] parseaddr (from email.utils) returns invalid input string instead of ('', '')

[Livio Bencik]

New submission from Livio Bencik <lbenc135 at gmail.com>:

```
from email.utils import parseaddr
parseaddr('randomstring')
```

returns ('', 'randomstring'), instead of ('', '') as the documentation says.

----------
components: email
messages: 386062
nosy: barry, lbenc135, r.david.murray
priority: normal
severity: normal
status: open
title: parseaddr (from email.utils) returns invalid input string instead of ('', '')
type: behavior
versions: Python 3.8, Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue43090>
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