JBS: broken commit references for old (fx8) fixes

[Jeanette Winzenburg]

an example is https://bugs.openjdk.org/browse/JDK-8123472 (was:  
RT-33442) - it's fixed Oct. 2013 (after the history of the current  
repository starts, which is Nov. 2011), the commit ref is

  http://hg.openjdk.java.net/openjfx/8/graphics/rt/rev/6d1c6c47a5dd


which opens an error page: "An error occurred while processing your  
request: revision not found: rt"

Bug or feature? Thought the old references are redirected to the  
current rep? If not, any way to fix them automatically? Or if intended  
for older commit refs: what's the cut-off date/version?

Not blocking, but a nuisance: need to find the commit manually in the  
local rep.

-- Jeanette