[Fixed] NumberFormatException: For input string: "Optional[-1]" am: 2259ae3d60 am: 104894e908

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/ImsServiceEntitlement/+/15186834

Change-Id: I2867f1c12886b2b509a01714673bcfc774df9693