Bahex 79f19f2fc7

Enable conditional source and use patterns by allowing null as a no-op module (#14773) ...

Related:
- #14329
- #13872
- #8214

# Description & User-Facing Changes

This PR allows enables the following uses, which are all no-op.
```nushell
source null
source-env null
use null
overlay use null
```

The motivation for this change is conditional sourcing of files. For
example, with this change `login.nu` may be deprecated and replaced with
the following code in `config.nu`
```nushell
const login_module = if $nu.is-login { "login.nu" } else { null }
source $login_module
```

# Tests + Formatting
I'm hoping for CI to pass 😄

# After Submitting
Add a part about the conditional sourcing pattern to the website.

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..

overlay

Enable conditional source and use patterns by allowing null as a no-op module (#14773)

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scope

Change the usage misnomer to "description" (#13598)

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alias.rs

Change the usage misnomer to "description" (#13598)

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break_.rs

Change the usage misnomer to "description" (#13598)

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collect.rs

Change the usage misnomer to "description" (#13598)

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const_.rs

Change the usage misnomer to "description" (#13598)

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continue_.rs

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def.rs

Change the usage misnomer to "description" (#13598)

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describe.rs

Start to Add WASM Support Again (#14418)

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do_.rs

Add run-time type checking for command pipeline input (#14741)

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echo.rs

Change the usage misnomer to "description" (#13598)

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error_make.rs

Change the usage misnomer to "description" (#13598)

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export_alias.rs

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export_const.rs

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export_def.rs

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export_extern.rs

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export_module.rs

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export_use.rs

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export.rs

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extern_.rs

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for_.rs

Error on non-zero exit statuses (#13515)

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hide_env.rs

Fix example for hide-env (#14013)

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hide.rs

Change the usage misnomer to "description" (#13598)

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if_.rs

Error on non-zero exit statuses (#13515)

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ignore.rs

Start to Add WASM Support Again (#14418)

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let_.rs

Fix try not working with let, etc. (#13885)

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loop_.rs

Error on non-zero exit statuses (#13515)

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match_.rs

Error on non-zero exit statuses (#13515)

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mod.rs

Remove lazy records (#12682)

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module.rs

Change the usage misnomer to "description" (#13598)

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mut_.rs

Fix try not working with let, etc. (#13885)

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return_.rs

Change the usage misnomer to "description" (#13598)

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try_.rs

Add label rendering to try/catch rendered errors (#14477)

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use_.rs

Enable conditional source and use patterns by allowing null as a no-op module (#14773)

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version.rs

Start to Add WASM Support Again (#14418)

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while_.rs

Error on non-zero exit statuses (#13515)

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