add jacketPath to challengesCache

scripts/common.lua

@@ -131,6 +131,10 @@ ImageFont.draw = function(this, text, x, y, alpha, hFlag, vFlag)
 end
 
 function GetDisplayDifficulty(jacketPath, difficulty)
+  if jacketPath == nil then
+    return difficulty
+  end
+
   local strippedPath = string.match(jacketPath:lower(), "[/\\][^\\/]+$")
   if difficulty == 3 and strippedPath then
         if string.find(strippedPath, "inf") ~= nil then

scripts/songselect/chalwheel.lua

@@ -143,7 +143,8 @@ local check_or_create_cache = function(challenge)
                     ["title"] = gfx.CreateLabel(missing_text, defaultLabelSize, 0),
                     ["title_raw"] = missing_text,
                     ["level"] = 0,
-                    ["difficulty"] = 0
+                    ["difficulty"] = 0,
+                    ["jacketPath"] = "",
                 }
             }
         else -- if not challenge.missing_chart then
@@ -153,7 +154,8 @@ local check_or_create_cache = function(challenge)
                     ["title"] = gfx.CreateLabel(chart.title, defaultLabelSize, 0),
                     ["title_raw"] = chart.title,
                     ["level"] = chart.level,
-                    ["difficulty"] = chart.difficulty
+                    ["difficulty"] = chart.difficulty,
+                    ["jacketPath"] = chart.jacketPath,
                 })
             end
             challengeCache[challenge.id]["charts"] = charts
@@ -403,8 +405,7 @@ draw_challenge = function(challenge, x, y, w, h, selected)
 
     for i, chart in ipairs(challengeCache[challenge.id]["charts"]) do
         local ypos = offsetY + paddingY * (i - 1)
-
-        local adjustedDiff = GetDisplayDifficulty(chart.jacketPath, chart.diff)
+        local adjustedDiff = GetDisplayDifficulty(chart.jacketPath, chart.difficulty)
         DiffRectangle.render(timer, offsetX, ypos, diffIconScale, adjustedDiff, chart.level)
 
         local _, titleHeight = gfx.LabelSize(chart.title)