+ fallback bpm if songbpm cannot be parsed

scripts/songselect/songwheel.lua

@@ -631,6 +631,13 @@ function tickTransitions(deltaTime)
             end
         end
 
+        -- If the original songBpm is "2021.04.01" for example, the above code can produce `nil` in the songBpm
+        -- since it cannot parse the number out of that string. Here we implement a fallback, to not crash
+        -- USC on whacky charts. Whacky charters, quit using batshit insane bpm values. It makes me angery >:(
+        if (songBpm == nil) then
+            songBpm = 120;
+        end
+
         transitionFlashScale = transitionFlashScale + deltaTime / (60/songBpm) -- transition should last for that time in seconds
     else
         transitionFlashScale = 0