* lisp/auth-source.el (auth-source-ignore-non-existing-file):
Rename it from `auth-source-ignore-empty-file'.
(auth-source-backends-parser-file): Use it.
* doc/misc/auth.texi (Help for users):
* etc/NEWS:
* test/lisp/auth-source-tests.el (auth-source-validate-backend)
(auth-source-test-netrc-create-secret):
Use `auth-source-ignore-non-existing-file'.