Fix newline for empty prompts#1655
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Closes #1648
Note: this does mean that in irregular exits (e.g. due to
?, or a panic) ofprompt_password, the new line would not be printed. But the only irregular that is there is theSIGTSTP/SIGTTIN/SIGTTOU, and actually with this patch the behaviour of those seems closer to ogsudo as well (e.g.^Zwill cause a newline to be printed anyway)In particular, any I/O errors in
read_unbufferedare handled byprompt_passwordand not propagated.