fix: Ignore empty annotations in the jq query #1483

Job	Run time
matrix-prep-bazelversion	5s
matrix-prep-os	1s
test (ubuntu-latest, 7.1.1, ., true)	2m 7s
test (ubuntu-latest, 7.1.1, ., false)	3m 2s
test (ubuntu-latest, 7.1.1, e2e/wasm, false)	2m 3s
test (ubuntu-latest, 7.1.1, e2e/smoke, true)	21s
test (ubuntu-latest, 7.1.1, e2e/smoke, false)	19s
test (ubuntu-latest, 7.1.1, e2e/assertion, true)	2m 31s
test (ubuntu-latest, 6.4.0, ., true)	3m 29s
test (ubuntu-latest, 6.4.0, ., false)	2m 43s
test (ubuntu-latest, 6.4.0, e2e/wasm, false)	39s
test (ubuntu-latest, 6.4.0, e2e/smoke, true)	16s
test (ubuntu-latest, 6.4.0, e2e/smoke, false)	18s
test (ubuntu-latest, 6.4.0, e2e/assertion, true)	3m 3s
	20m 57s

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