Darren Schroeder a46c21cffb
add plugin path when there are no signatures (#10201)
# Description

This PR adds the ability to have a `$nu.plugin-path` even when you
plugins are registered and it also should work with `nu -n --no-stdlib`.

### Before
It would give an error
```
│ plugin-path        │ IOError("Could not get plugin signature location")             │
```

### After
It returns the proper path, like this for me
```
│ plugin-path        │ /Users/fdncred/Library/Application Support/nushell/plugin.nu   │
```

Closed #10198 
# User-Facing Changes
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# Tests + Formatting
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2023-09-03 19:19:04 -05:00
..
2023-08-17 11:58:38 +03:00
2023-08-25 07:50:29 +12:00
2023-08-07 18:10:01 +12:00
2023-07-07 11:06:09 +02:00