Fix importing custom songs

public/src/js/importsongs.js

@@ -205,7 +205,7 @@
 				order: index + 1,
 				type: "tja",
 				chart: file,
-				stars: {},
+				courses: {},
 				music: "muted"
 			}
 			var coursesAdded = false

public/src/js/songselect.js

@@ -2279,7 +2279,7 @@ class SongSelect{
 			})
 		}
 		this.draw.songFrame(config)
-		if(config.song.p2Cursor !== null && p2.socket.readyState === 1){
+		if("p2Cursor" in config.song && config.song.p2Cursor !== null && p2.socket.readyState === 1){
 			this.draw.diffCursor({
 				ctx: ctx,
 				font: this.font,