Added error message when cannot contact version server

main/admin/index.php

@@ -400,6 +400,7 @@ function check_dokeos_version2()
 
 		$version_url= 'http://version.chamilo.org/version.php?url='.urlencode(api_get_path(WEB_PATH)).'&campus='.urlencode(api_get_setting('siteName')).'&contact='.urlencode(api_get_setting('emailAdministrator')).'&version='.urlencode($dokeos_version).'&numberofcourses='.urlencode($number_of_courses).'&numberofusers='.urlencode($number_of_users).'&donotlistcampus='.api_get_setting('donotlistcampus').'&organisation='.urlencode(api_get_setting('Institution')).'&adminname='.urlencode(api_get_setting('administratorName').' '.api_get_setting('administratorSurname'));
 		$handle=@fopen($version_url,'r');
+		if ($handle !== false) {
 			$version_info=trim(@fread($handle, 1024));
 	
 			if ($dokeos_version<>$version_info)
@@ -410,6 +411,9 @@ function check_dokeos_version2()
 			{
 				$output = '<br /><span style="color:green">'.get_lang('VersionUpToDate').': Dokeos '.$version_info.'</span>';
 			}
+		} else {
+            $output = '<span style="color:red">' . get_lang('ImpossibleToContactVersionServerPleaseTryAgain') . '</span>';
+		}
 	}
 	else
 	{