add more php8 checks

Author: pschou

rackrequest.php

@@ -88,7 +88,7 @@
 			$req->RequestedAction=$_POST['requestedaction'];
 			$req->Label=$_POST['label'];
 			$req->SerialNo=$_POST['serialno'];
-			$req->MfgDate=date('Y-m-d',strtotime($_POST["mfgdate"]));
+			$req->MfgDate=isset($_POST["mfgdate"])?date('Y-m-d',strtotime($_POST["mfgdate"])):"";
 			$req->AssetTag=$_POST['assettag'];
 			$req->Hypervisor=$_POST['hypervisor'];
 			$req->Owner=$_POST['owner'];
@@ -370,7 +370,7 @@
 	</div>
 	<div>
 		<div><label for="mfgdate">',__("Manufacture Date"),'</label></div>
-		<div><input type="text" name="mfgdate" id="mfgdate" size="20" value="',date('Y-m-d',strtotime($req->MfgDate)),'"></div>
+		<div><input type="text" name="mfgdate" id="mfgdate" size="20" value="',($req->MfgDate!==null)?date('Y-m-d',strtotime($req->MfgDate)):"",'"></div>
 	</div>
 	<div>
 		<div><label for="assettag">',__("Asset Tag"),'</label></div>