tests

add missing stub in av.sidedata #1099

Job	Run time
package-source	18s
style	16s
py-3.8 lib-6.1 ubuntu-latest	5m 12s
py-3.8 lib-6.0 ubuntu-latest	4m 13s
package-wheel (macos-latest, arm64)	14m 19s
py-3.8 lib-5.1 ubuntu-latest	4m 7s
package-wheel (macos-latest, x86_64)	27m 41s
py-3.8 lib-6.1 windows-latest	3m 36s
py-3.8 lib-5.0 ubuntu-latest	4m 1s
package-wheel (ubuntu-latest, aarch64)	3h 8m 21s
py-3.8 lib-6.0 windows-latest	3m 38s
py-pypy3.9 lib-6.1 ubuntu-latest	4m 36s
package-wheel (ubuntu-latest, i686)	22m 7s
py-3.8 lib-5.1 windows-latest	3m 29s
py-3.8 lib-6.1 macos-latest	11m 49s
package-wheel (ubuntu-latest, x86_64)	21m 6s
py-3.8 lib-5.0 windows-latest	3m 25s
package-wheel (windows-latest, AMD64)	15m 1s
publish	1s
	5h 37m 16s

Provide feedback