Avoid warning message - Adding Database::num_rows

main/install/update-files-1.8.6.1-1.8.6.2.inc.php

@@ -60,20 +60,22 @@ if (defined('SYSTEM_INSTALLATION') || defined('DOKEOS_COURSE_UPDATE')) {
 	$sql = "SELECT * FROM $db_name.course";
 	error_log('Getting courses for files updates: '.$sql, 0);
 	$result = Database::query($sql);
-
-	while ($courses_directories = Database::fetch_array($result)) {
-		$currentCourseRepositorySys = $sys_course_path.$courses_directories['directory'].'/';
-		// upload > announcements
-		if (!is_dir($currentCourseRepositorySys."upload/announcements")){
-			mkdir($currentCourseRepositorySys."upload/announcements", $perm);
-		}
-
-		// upload > announcements > images
-		if (!is_dir($currentCourseRepositorySys."upload/announcements/images")) {
-			mkdir($currentCourseRepositorySys."upload/announcements/images", $perm);
+	
+	if (Database::num_rows($result) > 0) {
+		while ($courses_directories = Database::fetch_array($result)) {
+			$currentCourseRepositorySys = $sys_course_path.$courses_directories['directory'].'/';
+			// upload > announcements
+			if (!is_dir($currentCourseRepositorySys."upload/announcements")){
+				mkdir($currentCourseRepositorySys."upload/announcements", $perm);
+			}
+	
+			// upload > announcements > images
+			if (!is_dir($currentCourseRepositorySys."upload/announcements/images")) {
+				mkdir($currentCourseRepositorySys."upload/announcements/images", $perm);
+			}
 		}
 	}
-
+	
 	//// Create a specific directory for global thumbails
 	// home > default_platform_document > template_thumb
 	if (!is_dir($pathForm.'home/default_platform_document/template_thumb')) {