Error parsing empty yaml documents

[Zebradil]

This works as expected (I do not provide a proper config to vendir, so the error is legit):

/tmp/tmp.6TXoJB3vud
❯ cat <<EOF | vendir sync -f-
---
apiVersion: v1
kind: Secret
metadata:
  name: vendir-secret
data:
  username: dXNlcg==
  password: MTIzNDU2
EOF
vendir: Error: Expected to find at least one config, but found none

This doesn't work as expected:

/tmp/tmp.6TXoJB3vud
❮ cat <<EOF | vendir sync -f-

---
apiVersion: v1
kind: Secret
metadata:
  name: vendir-secret
data:
  username: dXNlcg==
  password: MTIzNDU2
EOF
vendir: Error: Parsing resource config '-':
  Unknown apiVersion '' or kind '' for resource

Notice the blank line at the beginning of the second example. Having a blank line followed by the yaml document marker --- seems to be recognized by vendir as a yaml document. I would expect that such empty documents are just ignored.

Environment:

• vendir version: 0.32.1
• OS: Arch Linux

---

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[cppforlife]

im guessing go library is interpreting is as either null or {} for that first document. should be reasonable to ignore it. (PRs welcome)