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 a8f9a075b14c526a0de75c2ade81ebc4e05e4ef8)
(cherry picked from commit 56ea7b490107e4531ab4db6f74671c34b5c59fd3)
1 file changed