umask: symbolic mode cannot contain empty set

The following issue occurs on fish 3.6.4 and can be reproduced as follows. The following works fine:

> umask 0007
> umask
0007
> umask -S
u=rwx,g=rwx,o=

However, the symbolic mode equivalent does not work, regardless of order:

> umask u=rwx,g=rwx,o=
set: given 1 indexes but 0 values
> umask o=,u=rwx,g=rwx
set: given 1 indexes but 0 values

This works fine in bash, so I assume it should also work in fish. I have no third-party customizations. Note that the following is not equivalent:

> umask u=rwx,g=rwx

This does not override the value of o.

umask: Correctly handle empty symbolic value

@faho

Thanks for the quick fix @faho! Happy New Year!

umask: Correctly handle empty symbolic value

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