DO NOT MERGE) ExifInterface: Make saveAttributes throw an exception before change

ExifInterface object can be created with a unsupported file format.
If saveAttribute is called with an unsupported file format, ExifInterface
makes the file corrupted. This CL prevents those cases by throwing
an exception before making any change on the file.

CYNGNOS-3303
Bug: 30936376
Change-Id: I915f56b00ec9422b53591ac5534e070a1d6798e6
(cherry picked from commit 659275dc)
(cherry picked from commit 74a27160)