Fixed SIGSEGV when running helm create with -p and no values.yaml file

Signed-off-by: Sebastien Plisson <sebastien.plisson@gmail.com>

pkg/chartutil/create.go

@@ -307,8 +307,9 @@ func CreateFrom(chartfile *chart.Metadata, dest string, src string) error {
 	}
 
 	schart.Templates = updatedTemplates
+	if schart.Values != nil {
 		schart.Values = &chart.Config{Raw: string(Transform(schart.Values.Raw, "<CHARTNAME>", schart.Metadata.Name))}
-
+	}
 	return SaveDir(schart, dest)
 }