netrc treats empty quoted tokens as end-of-file

[lpyu001]

Bug description

netrc does not distinguish an empty quoted token ("") from end-of-file. When an empty token appears where a top-level or follower token is expected, parsing stops successfully and silently ignores the remaining content. It should raise netrc.NetrcParseError instead.

Reproduction code

import netrc
import tempfile
from pathlib import Path

with tempfile.TemporaryDirectory() as directory:
    path = Path(directory) / "test.netrc"
    path.write_text(
        '"" invalid\n'
        'machine example.com login alice password secret\n',
        encoding="utf-8",
    )

    parsed = netrc.netrc(path)
    print(parsed.hosts)  

CPython versions tested on:

CPython main branch

Operating systems tested on:

No response

Linked PRs

• gh-155468: Distinguish empty quoted tokens from EOF in netrc #155471
• [3.15] gh-155468: Distinguish empty quoted tokens from EOF in netrc (GH-155471) #156464
• [3.13] gh-155468: Distinguish empty quoted tokens from EOF in netrc(GH-155471) #156468
• [3.14] gh-155468: Distinguish empty quoted tokens from EOF in netrc(GH-155471) #156469