Fix a possible stacktrace on RandomPlayQueue

airsonic-main/src/main/java/org/airsonic/player/controller/RandomPlayQueueController.java

@@ -62,7 +62,7 @@ public class RandomPlayQueueController {
             ModelMap model,
             HttpServletRequest request,
             HttpServletResponse response,
-            @RequestParam(value = "size") int size,
+            @RequestParam(value = "size") Integer size,
             @RequestParam(value = "genre", required = false) String genre,
             @RequestParam(value = "year", required = false) String year,
             @RequestParam(value = "songRating", required = false) String songRating,
@@ -87,6 +87,10 @@ public class RandomPlayQueueController {
         boolean doesShowStarredSongs = false;
         boolean doesShowUnstarredSongs = false;
 
+        if (size == null) {
+            size = 24;
+        }
+
         // Handle the genre filter
         if (StringUtils.equalsIgnoreCase("any", genre)) {
             genre = null;