修正master_g老版本成绩在模式地图报错

parts/modes/master_g.lua

@@ -1,4 +1,3 @@
-
 local gradeList={
     "Grade 9","Grade 8","Grade 7","Grade 6","Grade 5","Grade 4","Grade 3","Grade 2","Grade 1",
     "S1","S2","S3","S4","S5","S6","S7","S8","S9",
@@ -10,13 +9,13 @@ return{
     env={
         freshLimit=15,
         fieldH=19,
-        sequence="bagES",
+        sequence='bagES',
         eventSet='master_g',
         bg='bg2',bgm='secret7th',
     },
     slowMark=true,
     score=function(P) return {P.modeData.gradePts,P.stat.time} end,
-    scoreDisp=function(D) return gradeList[D[1]].."   "..STRING.time(D[2])end,
+    scoreDisp=function(D) return(gradeList[D[1]]or D[1]).."   "..STRING.time(D[2])end,
     comp=function(a,b)return a[1]>b[1]or(a[1]==b[1]and a[2]<b[2])end,
     getRank=function(P)
         local G=P.modeData.gradePts