Google autocomplete on submit or enter

I have a search form with google autocomplete for location. If the users ignore the autocomplete or does not wait for the autofill and hits return or the submit button it returns no data because google really never found that autocomplete. I know how to stop the return but the submit button is tricky. Any suggestions?
Thanks in advance.

I have it selecting the top result with this script. But again, if they hit the search no results match cause autocomplete does not finish.

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