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.

Bug: 30936376
Change-Id: I115a42601c774062485974042464abb0d65c35e9
(cherry picked from commit a8f9a075)
(cherry picked from commit 56ea7b49)
(cherry picked from commit 73fdb1af54c396e87c5b7e07c6a84296f4bdb33b)