am 3f93b4d0: Tel Test: Fix SL4A crash bug in VoLTE Conf Call test. Original CL here:https://partner-android-review.googlesource.com/#/c/200276/8/Tools/sl4a/Common/src/com/googlecode/android_scripting/facade/tele/TelephonyStateListeners.java

* commit '3f93b4d07ac540d231c1ce999b0e4b1a55c826f0':
  Tel Test: Fix SL4A crash bug in VoLTE Conf Call test. Original CL here:https://partner-android-review.googlesource.com/#/c/200276/8/Tools/sl4a/Common/src/com/googlecode/android_scripting/facade/tele/TelephonyStateListeners.java