[Bug-tar] Whether to create archive for non-existent members

[Connor Behan]

Hello,

Most of my activity on this list has been related to the --one-top-level
option but I recall submitting a small patch awhile ago which I'm attaching.

It requires at least one specified file to pass an existence check
before an archive is created with -c. Admittedly, this makes the code
less readable. However it makes it harder to lose data by mistyping
arguments and I don't think it breaks compatibility. Afterall gtar
already claims that it refuses to create empty archives.

If you don't like this idea, I'm not going to argue. I just wanted to
make sure it was seen.

0001-Refuse-to-create-archive-for-non-existent-members.patch
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