gpsd_json: Filter out PRN from SKY w/o Elevation and Azimuth

NMEA says to not report bad elevation and azimuth, so
follow that advice.

This only affects some u-blox 8 binary, and one odd GREIS regression.

1 files changed, 10 insertions, 10 deletions

diff --git a/test/daemon/greis-test2.log.chk b/test/daemon/greis-test2.log.chk
index 6106cf98..68e295e1 100644
--- a/test/daemon/greis-test2.log.chk
+++ b/test/daemon/greis-test2.log.chk
@@ -2,31 +2,31 @@
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