fix track totals when not defined

toys/createindex

@@ -334,7 +334,7 @@ do
 	title="${rest%%::AtOM:SQL:Sep::*}"
 	rest="${rest#*::AtOM:SQL:Sep::}"
 	track="${rest%%::AtOM:SQL:Sep::*}"
-	tracktotal=${track#*/}
+	[[ $track =~ / ]] && tracktotal=${track#*/}
 	rest="${rest#*::AtOM:SQL:Sep::}"
 	year="${rest%%::AtOM:SQL:Sep::*}"
 	rest="${rest#*::AtOM:SQL:Sep::}"
@@ -499,6 +499,7 @@ do
 		oldrate=$rate
 		oldtimestamp=$timestamp
 	fi
+	unset tracktotal
 	olddir="$dir"
 done
 printline