Do not export an empty to path to a windows image config #2

Job	Run time
archutil-arm64	0s
prepare	5s
validate (lint-default)	1m 46s
validate (lint-golangci-verify)	34s
validate (lint-gopls)	3m 18s
validate (lint-labs)	1m 59s
validate (lint-nydus)	1m 54s
validate (lint-proto)	25s
validate (lint-yaml)	26s
validate (validate-archutil)	36s
validate (validate-docs)	59s
validate (validate-docs-dockerfile)	42s
validate (validate-doctoc)	23s
validate (validate-generated-files)	48s
validate (validate-shfmt)	20s
validate (validate-vendor)	40s
	14m 55s

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