fix: do not exit on empty arguments

[kuisathaverat]

Fix #1706

Compare the slice of arguments with an empty slice and a slice with one empty string. (credit @olblak)

Test

To test this pull request, you can run the following commands:

cat > test.yml << EOF
name: test
pipelineid: test

sources:
  one:
    name: 'Check {{ $updateChannel }} channel'
    kind: shell
    spec:
      command: echo 1
targets:
  one:
    name: 'Check {{ $updateChannel }} channel'
    kind: shell
    spec:
      command: echo 1
EOF
go run . apply "" --config test.yml

Additional Information

Tradeoff

Potential improvement

[olblak]

Thanks for the pullrquest, I am planning to trigger a release in the coming days as I made a few fixes around the registry