Merge branch 'patch-16' into 'dev-3.0'

execute was missing on query (mail adress existing check)

See merge request !39

content/intern/anmelden.php

@@ -37,6 +37,7 @@ if ($_POST['anmelden'] == "Jetzt anmelden!") {
         $nickname_check = $sql -> fetch();
         $sql = sql::$db->prepare("SELECT `emailadresse` FROM " ._VMS_. "_emaildaten WHERE emailadresse=:mail");
         $sql -> bindParam(':mail', $_POST['emailadresse'], PDO::PARAM_STR);
+        $sql -> execute();
         $mail_check = $sql -> fetch();
 
         if ($mail_check) $error .= 'Diese Emailadresse ist schon im System!<br>';