display better exception for traffic results if admin has no customers

admin_traffic.php

@@ -37,6 +37,9 @@ if ($page == 'overview' || $page == 'customers') {
 	try {
 		$context = Traffic::getCustomerStats($userinfo, $range);
 	} catch (Exception $e) {
+		if ($e->getCode() === 405) {
+			Response::dynamicError(lng('traffic.nocustomers'));
+		}
 		Response::dynamicError($e->getMessage());
 	}
 

lib/Froxlor/Api/ApiCommand.php

@@ -470,7 +470,7 @@ abstract class ApiCommand extends ApiParameter
 	 *
 	 * @param string $customer_hide_option
 	 *            optional, when called as customer, some options might be hidden due to the
-	 *            panel.customer_hide_options ettings
+	 *            panel.customer_hide_options settings
 	 *
 	 * @return array
 	 * @throws Exception

lng/de.lng.php

@@ -2117,6 +2117,7 @@ Vielen Dank, Ihr Administrator',
 		'http' => 'HTTP',
 		'ftp' => 'FTP',
 		'mail' => 'Mail',
+		'nocustomers' => 'Es wird mindestens ein Kunde benötigt um die Traffic Statistiken anzuzeigen.',
 	],
 	'translator' => '',
 	'update' => [

lng/en.lng.php

@@ -2243,6 +2243,7 @@ Yours sincerely, your administrator',
 		'http' => 'HTTP',
 		'ftp' => 'FTP',
 		'mail' => 'Mail',
+		'nocustomers' => 'You need at least one customer to view the traffic reports.',
 	],
 	'translator' => '',
 	'update' => [