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if the form shows the sweet alert box and then it redirects then remove 
the focus value from:

<script>
function validateForm() {
	var task = document.forms["task_form"]["task"].value;

	if ( !task.length ) {
		swal("Enter Task Description", "" , "warning") ;
		// document.getElementById("task").focus();  REMOVE THIS SHIT
		return false;
	}
}
</script>