bug: "make collect-firmware-refvals" failing with "jq: error (at <stdin>:1): Cannot iterate over null (null)"

[acancell-redhat]

$ make collect-firmware-refvals
...
Extracting reference values...
jq: error (at <stdin>:1): Cannot iterate over null (null)
make: *** [Makefile:23: collect-firmware-refvals] Error 5

I worrked around the error changing lines 177-178 of scripts/collect-firmware-refvals.sh to:

yq -r '.data.reference_value' "$TEMP_DIR/rvps-reference-values.yaml" | \
  jq 'map_values(@base64d | fromjson)' > "$OUTPUT_FILE"