James Teh 4e85ff0fe9 Bug 1802866: Don't send a11y cache pushes containing no data. r=nlapre
This can happen if we're pushing the tree for only moved (no new) Accessibles, since we don't send cache pushes for those.
It can also happen if an Accessible generates no cache data, which is rare but probably not impossible.
Making IPDL calls with no data is wasteful, so don't do it.

Differential Revision: https://phabricator.services.mozilla.com/D163203
2022-11-29 07:01:25 +00:00
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