am 31e27468: isEmpty checks all files like reset

* commit '31e27468b6d822adbd2aec9219a68c206aa6957c':
  isEmpty checks all files like reset
tree: 28c8484890c5447f83596425f8ce5d9896a182f9
  1. keystore/
  2. keystore-engine/
  3. softkeymaster/