Need PHP programmer to fix PHP/Ajax Bootstrap form – $15

I am looking for an experienced PHP coder to fix a couple issues on a PHP/Ajax Bootstrap contact form. It works fine except when the user leaves the input fields blank, the form still submits a 'successful submission'. It needs to be configured so that when someone leaves a input field blank, the submission returns an error, reminding the user to complete the fields. All the scripts including validation are there. I think, I might have missed a path to a file or something.
Also, the form…
Need PHP programmer to fix PHP/Ajax Bootstrap form – $15

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