Fix crash by video plugin
Fix crash by video plugin

  Uninitialized mPlayer causes crash
  Initialize mPlayer and check it in GetPlayerState()

Change-Id: I5b924e3ef320e0c68cbe09edc403cceaf147d5d9

dalihub/dali-adaptor,dalihub/dali-adaptor,dalihub/dali-adaptor,dalihub/dali-adaptor,dalihub/dali-adaptor