psychedelicious e706afe8a6 feat(ui): add valueOrNull to useMetadataItem
In order to allow for null and undefined metadata values, this hook returned a symbol to indicate that parsing failed or was pending.

For values where the parsed value will never be null or undefined, it is useful get the value or null (instead of a symbol).
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..
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Organization of the source tree:

app -- Home of nodes invocations and services
assets -- Images and other data files used by InvokeAI
backend -- Non-user facing libraries, including the rendering
	core.
configs -- Configuration files used at install and run times
frontend -- User-facing scripts, including the CLI and the WebUI
version -- Current InvokeAI version string, stored
	in version/invokeai_version.py