Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/e08fdc728a0b
Author: Ryan VanderMeulen <ryanvm@gmail.com>
Desc: Revert "Merge pull request #18449 from gasolin/issue-993832"

This reverts commit 9ce3fa58b57c5665a99dce2003e7b03a0b284770, reversing
changes made to a79a34f8114f5804f363685d717734c383f0d8ab.

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https://hg.mozilla.org/integration/gaia-central/rev/981e3b33957f
Author: Hubert Figuière <hub@figuiere.net>
Desc: Merge pull request #18430 from hfiguiere/bug987383-2

Bug 987383 - Make sure to deal with empty output so that JSON stay valid r=julienw

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https://hg.mozilla.org/integration/gaia-central/rev/54b2dbf532ac
Author: Hubert Figuière <hub@figuiere.net>
Desc: Bug 987383 - Make sure to deal with empty output so that JSON stay valid. r=
Bumping manifests a=b2g-bump