Ignore empty submodule clone configs #3122
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Description
A small bit of hardening - if
BUILDKITE_GIT_SUBMODULE_CLONE_CONFIGis set but empty, thenGitSubmoduleCloneConfigcan be a slice with one element"", causing an invalid Git flag to be appended.Context
https://coda.io/d/_dHnUHNps1YO#Escalations-by-Assignee_tugT4T3x/r883&view=center
Testing
go test ./...). Buildkite employees may check this if the pipeline has run automatically.go fmt ./...)