fix: don't fail info/invoke if eventing missing (#823)
fix: don't fail info/invoke if eventing missing (#823)

If eventing is not installed, the user should still be able to get info and use
`kn invoke`. Don't fail, if `describe` finds eventing missing.

Fixes: https://github.com/knative-sandbox/kn-plugin-func/issues/822

Signed-off-by: Lance Ball <637094cbcafd6c4c397ebad24eca1a25fa2cf312@redhat.com>
knative/func,knative/func,knative/func,knative/func,knative/func,knative/func,knative/func