Fix the case of null values in JSON #1487
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Fixes #1466.
The cause was a nil value in the incoming JSON, which the generic
filtering code didn't expect.
I considered adding a
recover
to genericfiltering so that things like this don't crash the whole process, but decided
against. One reason is that it's better to discover these things while we're
still in alpha/beta. Second is that if we recover here, there could still be a
crash later in filtering our outputs.
Also took the opportunity to add a couple of system tests that combine json
and generic filtering.