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Fixes python-babel#1219. Some tools (e.g. Poedit) leave these headers blank instead of eliding them or using the 'YEAR-MO-DA HO:MI+ZONE' placeholder. _parse_datetime_header() passed the blank value straight to datetime.strptime(), raising ValueError('time data '' does not match format...') and crashing pybabel on any such file, as reported. Treat a blank (or whitespace-only) value the same as an unset header: return None, matching the existing precedent a few lines up for the Language header ('if the header's value is an empty string, which is what some tools generate').
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Fixes #1219.
Bug
Some tools (e.g. Poedit) leave
PO-Revision-DateorPOT-Creation-Dateblank in a.pofile's header, instead of eliding the header or using theYEAR-MO-DA HO:MI+ZONEplaceholder._parse_datetime_header()passes that blank value straight todatetime.strptime(), which crashes:This takes down
pybabelentirely when updating or compiling such a file, as reported.Fix
Treat a blank (or whitespace-only) header value the same as an unset one: return
Noneinstead of raising. This matches the existing precedent a few lines up in the same function for theLanguageheader ("if the header's value is an empty string, which is what some tools generate").Test plan
test_datetime_parsing_blank_value_returns_none, parametrized over''and' '.read_po()on a.pofile with blankPO-Revision-Date/POT-Creation-Dateheaders, confirmed it's gone after the fix (both attributes becomeNone).pytest tests/messages/test_catalog.py— 21 passed (up from 19), same 25 pre-existing failures unrelated to this change (missing CLDR data files in this source checkout —RuntimeError: The babel data files are not available, identical failure list with and without this fix).ruff check/ruff format --checkclean on the changed lines.