Guard in short-circuit evaluations for stringSplit methods.

* splitRange function should also check if string is empty instead of
  just checking for null, as a faulty camera can return
  an empty RangeLength string.
* See (stripped) logcat: http://pastebin.com/kVV3ZJhz

Change-Id: Icbb8f12d1c2511366856889edc9b2060b764f2d0

Camera: Use TextUtils.isEmpty to check null + empty

Change-Id: I2e2233b834a391cc10dfca8c114e699828758c16