
Fixes FileReader so empty files do not result in calling the error callback.  The problem was reading an empty file would lead to the "result" attribute being "", which would fail the "if (result)" check.

http://www.w3.org/TR/FileAPI/#filedata-attr says the result attribute will be null if it is not the contents of the file.

R=nweiz
DELTA=1  (0 added, 0 deleted, 1 changed)


Revision created by MOE tool push_codebase.
MOE_MIGRATION=4336


git-svn-id: 35241bd708fe29f1f6c7a4322d322e99ff93b95e@1642 0b95b8e8-c90f-11de-9d4f-f947ee5921c8

rethinkdb/google-closure-library,Kuniwak/google-closure-library-jsdoc,rethinkdb/google-closure-library,jarib/google-closure-library,jarib/google-closure-library,Kuniwak/google-closure-library-jsdoc,rethinkdb/google-closure-library