file upload not validating on null input - php

Question

I am using $_FILES for multiple file upload the problem is it is not validating the null condition i have two multiple input files and I want to check whether an image has been uploaded to a specific input type file and on the basis of that I am validating if input 1 has no image uploaded then do nothing I went through dozens of examples on the internet but still it is running both blocks. Here's my code:
<form method="post" action="flyers_admin_process.php" enctype='multipart/form-data'>
<h4 style="margin-bottom: 8%;">Add flyers for Canada(You Can Choose multiple Files)</h4>
<div style="margin-top: 2%;margin-bottom: 6%" class="uk-width-large-1 uk-width-medium-1-1">
<input type="file" id="fileName" name="fileName[]" multiple>
</div>
<h4 style="margin-bottom: 8%;">Add flyers for USA(You Can Choose multiple Files)</h4>
<div style="margin-top: 2%;margin-bottom: 6%" class="uk-width-large-1 uk-width-medium-1-1">
<input type="file" id="fileName2" name="fileName2[]" multiple>
</div>
<input type="submit" />
</form>
flyers_admin_process.php file
<?php
include "db.php";
if($_SERVER['REQUEST_METHOD']=="POST") {
if(!empty($_FILES["fileName"]["name"])) {
echo "inside 1";
$path = "flyers_canada/"; // Upload directory
$count = 0;
foreach ($_FILES['fileName']['name'] as $f => $name) {
if(move_uploaded_file($_FILES["fileName"]["tmp_name"][$f], $path.$name))
$filetmp = $_FILES["fileName"]["tmp_name"][$f];
$filename = $_FILES["fileName"]["name"][$f];
$filepath = "flyers_canada"."/".$filename;
$query="INSERT INTO `flyers_canada`(`path`) VALUES (?)";
$stmt = $db->prepare($query);
if($stmt){
$stmt->bind_param("s",$filepath);
$stmt->execute();
$stmt->close();
}
$count++; // Number of successfully uploaded file
}
}
if(!empty($_FILES["fileName2"]["name"])) {
echo "inside 2";
$path = "flyers_usa/"; // Upload directory
$count = 0;
foreach ($_FILES['fileName2']['name'] as $f => $name) {
if(move_uploaded_file($_FILES["fileName2"]["tmp_name"][$f], $path.$name))
$filetmp = $_FILES["fileName2"]["tmp_name"][$f];
$filename = $_FILES["fileName2"]["name"][$f];
$filepath = "flyers_usa"."/".$filename;
$query="INSERT INTO `flyers_usa`(`path`) VALUES (?)";
$stmt = $db->prepare($query);
if($stmt){
$stmt->bind_param("s",$filepath);
$stmt->execute();
$stmt->close();
}
$count++; // Number of successfully uploaded file
}
}
?>
<script language="javascript">
// alert('Flyer has been added succesfully!');
// location.href = "flyers-admin.php";
</script>
<?php
}
?>