Andrew Kaster 170a7e263c Userland: Fail Core::find_executable_in_path on empty inputs ...

Before this patch, `which ""` or `type ""` would say that the empty
string is `/usr/local/bin/`.

Convert callers to consistently call is_empty() on the returned string
while we're at it, to support eventually removing the is_null() String
state in the future.

2022-01-04 07:38:42 +00:00

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