Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

========

https://hg.mozilla.org/integration/gaia-central/rev/d50fc20a887b
Author: Carsten Book <tomcat@mozilla.com>
Desc: Merge pull request #25155 from kumarrishav/Bug-1062034

Bug 1062034 - [1.4] Upon receiving empty message, notification containining "(null)"is displayed. r=felash

========

https://hg.mozilla.org/integration/gaia-central/rev/bae7bee89835
Author: kumarrishav <rishav006@gmail.com>
Desc: Bug 1062034 - [1.4] Upon receiving empty message, notification containing "(null)" is displayed
Bumping manifests a=b2g-bump