fix(ui) When opening drawer(like media drawer) error is written to the log

[tsemachh]

This fixes #7497
It's a small fix which will clear our logs at last Quoting from the issue:

When opening drawer(like media drawer) error is written to the log.
This relates to next fixed issue
(https://github.com/payloadcms/payload/pull/7117/files)
In file:
packages/ui/src/utilities/buildFormState.ts - Lines 70-74
` const schemaPathSegments = schemaPath && schemaPath.split('.')

let fieldSchema: Field[]

if (schemaPathSegments.length === 1) {
`
What happens is the first line fixes case where schemaPath is null | undefined,
now the last line there fails of schemaPathSegments is null | undefined

It's reported in few issues , I am not trying to resolve why next.js is not stopping the reques processing , just don't want to see it in the logs

[tsemachh]

I see it's fixed now - thank you