Fix crash if there is no album_image

diff --git a/jamendo.lua b/jamendo.lua
index 9308dc2de0162bce144741ccf43bc4ca9e7f9155..3f985c48fc990d8351604fbbcb0ec8f9c36d07cc 100644 (file)
--- a/jamendo.lua
+++ b/jamendo.lua
@@ -16,6 +16,7 @@ local assert = assert
 local print = print
 local tonumber = tonumber
 local math = math
+local tostring = tostring
 
 module('jamendo')