Fix the converts an empty string to nil.

Kubernetes-commit: 9759fc3c2306c5a82998899ffb189c381145199a

Author: HirazawaUi

pkg/runtime/converter.go

@@ -231,7 +231,7 @@ func (c *fromUnstructuredContext) pushKey(key string) {
 
 }
 
-// FromUnstructuredWIthValidation converts an object from map[string]interface{} representation into a concrete type.
+// FromUnstructuredWithValidation converts an object from map[string]interface{} representation into a concrete type.
 // It uses encoding/json/Unmarshaler if object implements it or reflection if not.
 // It takes a validationDirective that indicates how to behave when it encounters unknown fields.
 func (c *unstructuredConverter) FromUnstructuredWithValidation(u map[string]interface{}, obj interface{}, returnUnknownFields bool) error {
@@ -465,7 +465,7 @@ func sliceFromUnstructured(sv, dv reflect.Value, ctx *fromUnstructuredContext) e
 			}
 			dv.SetBytes(data)
 		} else {
-			dv.Set(reflect.Zero(dt))
+			dv.Set(reflect.MakeSlice(dt, 0, 0))
 		}
 		return nil
 	}

pkg/runtime/converter_test.go

@@ -91,6 +91,7 @@ type F struct {
 	G []int             `json:"fg"`
 	H []bool            `json:"fh"`
 	I []float32         `json:"fi"`
+	J []byte            `json:"fj"`
 }
 
 type G struct {
@@ -751,6 +752,10 @@ func TestUnrecognized(t *testing.T) {
 			data: "{\"ff\":[\"abc\"],\"fg\":[123],\"fh\":[true,false]}",
 			obj:  &F{},
 		},
+		{
+			data: "{\"fj\":\"\"}",
+			obj:  &F{},
+		},
 		{
 			// Invalid string data
 			data: "{\"fa\":123}",