Merge "c2SoftAacEnc: fix bad optional access of frame pts" into main am: cd1f39d6 am: 645343d3

Original change: https://android-review.googlesource.com/c/platform/frameworks/av/+/3503373



Change-Id: Ic1ea278431a3babcbb5e87a7ffd65ce7acf2d9c6
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>