Add newline before prompt only when previous output exists #419
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Description
As #327 described, a newline is printed when there is no previous output. With this PR, the newline is omitted when the terminal is first opened or cleared using Ctrl-L.
Referred to the implementation from pure-fish, specifically in the files _pure_prompt_new_line.fish and _pure_init.fish.
BTW, feel free to squash commits when merging!
Motivation and Context
Closes #327
Screenshots (if appropriate)
How Has This Been Tested
Checklist