Error swallowed for ipfs get when sending output to /dev/null

[justindotpub]

File this issue to the appropriate upstream project, or a PR.

# When we don't have anything under the CID, we get the "not found locally" error as expected
$ ipfsi 1 get QmWXCR7ZwcQpvzJA5fjkQMJTe2rwJgYUtoSxBXFZ3uBY1W --offline -o /dev/null
Error: block was not found locally (offline): ipld: could not find QmWXCR7ZwcQpvzJA5fjkQMJTe2rwJgYUtoSxBXFZ3uBY1W

# For this CID, I have some children but not all.  With redirect to /dev/null there is no "not found locally" error
$ ipfsi 1 get QmZZ52hRLbWnE7BKvxxTyjG4sX2uWtyjgUgM2w8LUYrioz --offline -o /dev/null
Saving file(s) to /dev/null
 46.42 KiB / 46.42 KiB [==========================================================================================] 100.00% 0s

# If I don't redirect to /dev/null I see the "not found locally" error after the download of the CIDs we have
$ ipfsi 1 get QmZZ52hRLbWnE7BKvxxTyjG4sX2uWtyjgUgM2w8LUYrioz --offline             
Saving file(s) to QmZZ52hRLbWnE7BKvxxTyjG4sX2uWtyjgUgM2w8LUYrioz
 46.42 KiB / 46.42 KiB [==========================================================================================] 100.00% 0s
Error: block was not found locally (offline): ipld: could not find QmUPqayeHDexr1nMjURxBLyEF7CAEckv5c9U5LmbBaYmem