Fix an oversight in the FixedLenDecoderEmitter where we weren't correctly checking the success result of custom decoder hooks on singleton decodings.
Fix an oversight in the FixedLenDecoderEmitter where we weren't correctly checking the success result of custom decoder hooks on singleton decodings.


git-svn-id: a4a6f32337ebd29ad4763b423022f00f68d1c7b7@137171 91177308-0d34-0410-b5e6-96231b3b80d8

lodyagin/bare_cxx,lodyagin/bare_cxx,lodyagin/bare_cxx,lodyagin/bare_cxx,lodyagin/bare_cxx