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Fix empty or broken diff link provided when page is first version

Authored by Pwirth on Jul 5 2019, 1:01 PM.

Description

Fix empty or broken diff link provided when page is first version

> Needs cherry-pick to REL1_31_dev and REL1_31

Change-Id: I53b34c581ff6e7f866892718c3453c2536ede067

Details