title: Laravel mimes validation always called even if no input file is uploaded (Not used required rule)
body: <p>I have used single validation rule only for file input field. That is mimes rule. I wanted to skip this rule if no file is uploaded, so i have not used 'required' rule. But it is always showing mime type message even if no file is uploaded. I have just added required rule for testing , at that time it shown required error message. This problem is only when submitting form using ajax with jquery.form.js</p>