Import failed on main library 70,000 plus comics

[bigredone10]

During import, the core-services exited with the following error:

Error: ENOENT: no such file or directory, open '/userdata/covers/100 Bullets #82 1999/100 Bullets 082 G85-Megan pg01.jpg' Emitted 'error' event on ReadStream instance at: at internal/fs/streams.js:126:14 at FSReqCallback.oncomplete (fs.js:179:23) { errno: -2, code: 'ENOENT', syscall: 'open', path: '/userdata/covers/100 Bullets #82 1999/100 Bullets 082 G85-Megan pg01.jpg' }

[rishighan]

As of today, @bigredone10 reported a successful import of roughly 86k comics. Keeping this open as a catch-all for all queue-related issues while importing.

[rishighan]

Adding @nstephenh to this issue to investigate the reason for import failure.

Some facts:

1. AirDC++ and ThreeTwo are on the same physical box, but one is a linux vm and the other is a freebsd jail.
2. Attempting import of 11.2k folders, 364.8k files from a SMB share
3. Restarted the stack maybe 5 total times over the course of the past few days.
4. Running Truenas