Studio checksum from name. Default image

graphql/documents/mutations/studio.graphql

@@ -1,7 +1,7 @@
 mutation StudioCreate(
   $name: String!,
   $url: String,
-  $image: String!) {
+  $image: String) {
 
   studioCreate(input: { name: $name, url: $url, image: $image }) {
     ...StudioData

graphql/schema/types/studio.graphql

@@ -12,7 +12,7 @@ input StudioCreateInput {
   name: String!
   url: String
   """This should be base64 encoded"""
-  image: String!
+  image: String
 }
 
 input StudioUpdateInput {