Link.Create fails when file owner is an empty string

[e9gille]

In an unusual scenario, starting a docker container within a GItHub runner, the owner of the files that are accessed is a user not defined within the current docker container. When using 5 ⎕NINFO file it returns an empty string. Link tries to set the attributes of the function and fails with a length error.
See:

link/StartupSession/Link/Utils.apln

Line 834 in 9f6ab1d

owner←2⊃⎕NPARTS owner ⍝ remove domain: foo/bar → bar; bar → bar