Fix crash on empty form submit

public/actions/submit.php

@@ -11,8 +11,8 @@ require_once __DIR__ . "/../../lib/requiredpublic.php";
 require_once __DIR__ . "/../../lib/Email.lib.php";
 
 function errorBack(string $errormsg) {
-    global $familyid;
-    //header("Location: ../?page=signup&error=" . htmlentities($errormsg));
+    global $familyid, $database;
+    header("Location: ../?page=signup&error=" . htmlentities($errormsg));
     $database->delete("families", ["familyid" => $familyid]);
     die($errormsg);
 }
@@ -31,6 +31,10 @@ $database->action(function($database) {
 
     $emails = [];
 
+    if (!isset($_POST["people"]) || empty($_POST["people"])) {
+        errorBack("You need to register at least one person.");
+    }
+
     try {
 
         $people = $_POST['people'];