Ignore empty objects from streams and error when nothing passed to create

Passing zero objects to create should be an error

hack/test-cmd.sh

@@ -115,6 +115,9 @@ for version in "${kube_api_versions[@]}"; do
     [ "$(kubectl get minions -t $'{{ .apiVersion }}' "${kube_flags[@]}")" == "${version}" ]
   fi
 
+  # passing no arguments to create is an error
+  [ ! $(kubectl create) ]
+
   kube::log::status "Testing kubectl(${version}:pods)"
   kubectl get pods "${kube_flags[@]}"
   kubectl create -f examples/guestbook/redis-master.json "${kube_flags[@]}"
@@ -144,14 +147,11 @@ for version in "${kube_api_versions[@]}"; do
           "apiVersion": "v1beta1",
           "id": "service-${version}-test",
           "port": 80,
-          "protocol": "TCP",
-          "labels": {
-              "name": "${version}"
-          }
+          "protocol": "TCP"
       }
 __EOF__
-  kubectl get services "something-${version}" "${kube_flags[@]}"
   kubectl get services "${kube_flags[@]}"
+  kubectl get services "service-${version}-test" "${kube_flags[@]}"
   kubectl delete service frontend "${kube_flags[@]}"
 
   kube::log::status "Testing kubectl(${version}:replicationcontrollers)"

pkg/kubectl/cmd/create.go

@@ -55,6 +55,7 @@ Examples:
 				Flatten().
 				Do()
 
+			count := 0
 			err = r.Visit(func(info *resource.Info) error {
 				data, err := info.Mapping.Codec.Encode(info.Object)
 				if err != nil {
@@ -66,11 +67,15 @@ Examples:
 				if err := resource.NewHelper(info.Client, info.Mapping).Create(info.Namespace, true, data); err != nil {
 					return err
 				}
+				count++
 				// TODO: if generation of names added to server side, change this to use the server's name
 				fmt.Fprintf(out, "%s\n", info.Name)
 				return nil
 			})
 			checkErr(err)
+			if count == 0 {
+				checkErr(fmt.Errorf("no objects passed to create"))
+			}
 		},
 	}
 	cmd.Flags().VarP(&flags.Filenames, "filename", "f", "Filename, directory, or URL to file to use to create the resource")

pkg/kubectl/resource/visitor.go

@@ -17,6 +17,7 @@ limitations under the License.
 package resource
 
 import (
+	"bytes"
 	"fmt"
 	"io"
 	"io/ioutil"
@@ -356,6 +357,10 @@ func (v *StreamVisitor) Visit(fn VisitorFunc) error {
 			}
 			return err
 		}
+		ext.RawJSON = bytes.TrimSpace(ext.RawJSON)
+		if len(ext.RawJSON) == 0 || bytes.Equal(ext.RawJSON, []byte("null")) {
+			continue
+		}
 		info, err := v.InfoForData(ext.RawJSON, v.Source)
 		if err != nil {
 			if v.IgnoreErrors {