[svn r14454] Fix warning message about function return value inside condition (see FS#2304)

main/inc/lib/add_course.lib.inc.php

@@ -1672,7 +1672,8 @@ function fill_Db_course($courseDbName, $courseRepository, $language,$default_doc
 
 	if(api_get_setting('service_visio','active')=='true')
 	{
-		if(!empty(api_get_setting('service_visio','visio_host')))
+		$mycheck = apu_get_setting('service_visio','visio_host');
+		if(!empty($mycheck))
 		{
 			api_sql_query("INSERT INTO `" . $tbl_course_homepage . "` VALUES ('', '" . TOOL_VISIO_CONFERENCE . "','conference/index.php?type=conference','visio_meeting.gif','1','0','squaregrey.gif','NO','_self','interaction')");
 			api_sql_query("INSERT INTO `" . $tbl_course_homepage . "` VALUES ('', '" . TOOL_VISIO_CLASSROOM . "','conference/index.php?type=classroom','visio.gif','1','0','squaregrey.gif','NO','_self','authoring')");