fix: GetService & handling missing services

pkg/container/container.go

@@ -14,8 +14,8 @@ import (
 )
 
 // GetContainer retrieves a container. If prompt is true and the retrievd count
-// of containers does not match expectedN, then a prompt is presented to let
-// the user choose.
+// of containers does not match 1, then a prompt is presented to let the user
+// choose. A count of 0 is handled gracefully.
 func GetContainer(c context.Context, cl *client.Client, filters filters.Args, prompt bool) (types.Container, error) {
 	containerOpts := types.ContainerListOptions{Filters: filters}
 	containers, err := cl.ContainerList(c, containerOpts)