Fixes #6710 Throw error when invalid client_id is passed in a remote API function

Author: Till Brehm

interface/lib/classes/remoting_lib.inc.php

@@ -127,6 +127,10 @@ function loadUserProfile($client_id_param = 0) {
 			$_SESSION["s"]["user"]["typ"] = 'admin';
 		} else {
 			$user = $app->db->queryOneRecord("SELECT * FROM sys_user WHERE client_id = ?", $this->client_id);
+			if(empty($user)) {
+                throw new SoapFault('invalid_client_id', 'Invalid client_id '.$this->client_id);
+			    return false;
+            }
 			$this->sys_username         = $user['username'];
 			$this->sys_userid            = $user['userid'];
 			$this->sys_default_group     = $user['default_group'];