fallback to operating system 'other' if unknown OS is specified

server/webserver/user/include/libflocklab.php

@@ -1011,7 +1011,9 @@ function update_add_test($xml_config, &$errors, $existing_test_id = NULL, $abort
 				foreach($available_platforms as $key => $platform)
 					if (strcasecmp($platform[0]['name'], trim($im->platform)) == 0)
 						$im_cpy['platform'] = $key;
-				$im_os = isset($im->os) ? trim($im->os) : 'other';
+				if(!isset($im->os) || !in_array($im->os, $available_os)) {
+					$im_os = 'other';
+				}
 				foreach($available_os as  $key => $os) {
 					if (strcasecmp($os, $im_os) == 0) {
 						$im_cpy['os'] = $key;