andyzhangx: Automated cherry pick of #92330: fix: don't use docker config cache if it's empty

JobBuild
93313
07-22 02:19
e8078bf2
07-22 02:17
unknown
07-22 02:17
pull-kubernetes-bazel-build 1289383882470199297 1285760986204082178
pull-kubernetes-bazel-test 1289383882478587904 1285760986250219522
pull-kubernetes-dependencies 1289383882453422082 1285760986204082176
pull-kubernetes-e2e-aks-engine-azure 1285760986254413826
pull-kubernetes-e2e-azure-disk 1285760986254413827
pull-kubernetes-e2e-azure-disk-vmss 1285760986250219523
pull-kubernetes-e2e-azure-disk-windows 1285785396726206465 1285760986250219521
pull-kubernetes-e2e-azure-file 1285760986254413825
pull-kubernetes-e2e-azure-file-windows 1285760986254413824
pull-kubernetes-e2e-gce 1289383882453422081 1285813204764594182 1285785396747177984 1285760986204082179
pull-kubernetes-e2e-gce-100-performance 1289383882457616384 1285785396722012160 1285760986250219520
pull-kubernetes-e2e-gce-device-plugin-gpu 1285813204777177088 1285785396709429248 1285760986216665088
pull-kubernetes-integration 1289383882478587905 1285785396726206464 1285760986204082177
pull-kubernetes-kubemark-e2e-gce-big 1289383882474393600 1285785396742983680 1285760986225053696
pull-kubernetes-node-e2e 1289392942208782336 1289383882470199296 1285785396734595072 1285760986237636608
pull-kubernetes-typecheck 1289383882453422080 1285760986216665089
pull-kubernetes-verify 1289696695524790272 1289601567741186048 1289501155985985536 1289383882474393601 1285760986199887872