All other get_*_by_name functions have errcheck=False. This makes it
return None for an invalid name instead of raising a GDALException.

And made an example use naming consistent with the rest of the doc.

Thanks leon-matthews for the report and fix.

Fixed #26344 -- Made EmailMessage include alternatives when the body is empty and it has attachments.

The test is a regression for refs #4740 to show that the original fix of
OGRIndexError is no longer needed.

This is similar to the removal of GEOSIndexError in
197b1878.

Fixed #28550 -- Restored contrib.auth's login() and logout() views' respect of positional arguments.

Regression in 78963495.

Forwardport of f8e0557b from stable/1.11.x

Unused since 197b1878.

Thanks Idan Melamed for the original patch.

"Importing the view" is no longer applicable after
a9fd740d.

Previously, deferring fields in different classes didn't omit the
superclass' deferred field.

Thanks Simon Charette for the suggested fix.

Previously, it was a QuerySet which could reevaluate to a new value if the
model's data changes. This is inconsistent with other Field.value_from_object()
methods.

This allows reverting the fix in the admin for refs #27998.