https://bugzilla.wikimedia.org/show_bug.cgi?id=28202

--- Comment #1 from Mark Clements (HappyDog) <[email protected]> 2011-03-23 
12:37:17 UTC ---
Actually, thinking about it, I'm not sure what a blank diff actually means.

Can it represent an error condition, or does it always mean just that there is
no diff text to show - e.g. that there were only moves/renames/deletions and no
content changes.

If it can mean either, is there any way we can differentiate between error
conditions and valid blank diffs?

Either way, we should probably be returning an empty string rather than a
constant for genuinely blank diffs, as this is not an error condition!

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