[DataGrid] avoid crash on undefined rowTree entry in tree level position selector

[sinore69]

Fixes #18645

Steps to reproduce:

visit - https://mui.com/x/react-data-grid/server-side-data/row-grouping/

• You expand first row
• After, you expand second row
• After click the "regenarate data"

You will get this : "TypeError: Cannot read properties of undefined (reading 'depth')"

Expected behaviour: no error

MUI.bug.fix.-.Made.with.Clipchamp.mp4

[mui-bot]

Deploy preview: https://deploy-preview-18647--material-ui-x.netlify.app/

Bundle size report

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Details of bundle changes

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[sinore69]

Hi @maintainers,
Could someone please help add the appropriate type: label to this PR? It seems like I'm unable to do it myself due to permission restrictions. Thanks in advance!