arrow

ARROW-12993: [Python] Avoid half-initialized FeatherReader object

When trying to read an invalid Feather file, the `stackprinter` project
would crash when walking the stack and attempting to print detailed information
about captured local variables.

Specifically, the crash would occur when looking up the `version` attribute
on the half-initialized FeatherReader object.

Closes #10480 from pitrou/ARROW-12993-feather-uninitialized

Authored-by: Antoine Pitrou <antoine@python.org>
Signed-off-by: Antoine Pitrou <antoine@python.org>