Fix seekbar position for zero length audio (#9949)

src/utils/numbers.ts

@@ -38,5 +38,6 @@ export function percentageWithin(pct: number, min: number, max: number): number
 }
 
 export function percentageOf(val: number, min: number, max: number): number {
-    return (val - min) / (max - min);
+    const percentage = (val - min) / (max - min);
+    return Number.isNaN(percentage) ? 0 : percentage;
 }