streamingccl/streampb: ensure there's at least one go source file #74888
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Fixes #74887
When the directory is empty (prior to deriving .pb.go from .proto),
the go compiler has no package name for that directory.
This prevents the execution of
go mod tidy
andmake vendor_rebuild
, and even prevents the generation of the.pb.go
file, resulting in a catch-22.
Release note: None