[Autocomplete] Fixed crash during keyboard navigation when renderTags function returns nothing

[gauravsoti1]

• Inside useAutoComplete, only focusing on tag if it is present

• Added test in Autocomplete.test.js

• [x] I have followed (at least) the PR section of the contributing guide.

Closes https://github.com/mui/material-ui/issues/27933 Closes https://github.com/mui/material-ui/pull/27949

[mui-bot]

Details of bundle changes

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