d1695d29a6
In 642e17aa35 when we moved the
patch entity out of the database and started relying on Ehcache to
store it we broke the "No Differences" by providing a BINARY file
when they were identical. Instead of showing "No Differences"
Gerrit gave us a unified file view with an empty diff header.
By tossing the FileHeader object and creating an empty byte array
for the header we can get the UI to render this case correctly again.
Change-Id: I36b0eac54bfe49f1210b912bab616dc3f36e5b02
Signed-off-by: Shawn O. Pearce <sop@google.com>