Fix pointer returns from directive

codegen/args.gotpl

@@ -14,6 +14,10 @@ func (ec *executionContext) {{ $name }}(ctx context.Context, rawArgs map[string]
 				}
 				if data, ok := tmp.({{ $arg.TypeReference.GO | ref }}) ; ok {
 					arg{{$i}} = data
+				{{- if $arg.TypeReference.IsNilable }}
+					} else if tmp == nil {
+						arg{{$i}} = nil
+				{{- end }}
 				} else {
 					return nil, fmt.Errorf(`unexpected type %T from directive, should be {{ $arg.TypeReference.GO }}`, tmp)
 				}

codegen/field.gotpl

@@ -107,6 +107,11 @@
 		if data, ok := tmp.({{ .TypeReference.GO | ref }}) ; ok {
 			return data, nil
 		}
+		{{- if .TypeReference.IsNilable -}}
+			else if tmp == nil {
+				return nil, nil
+			}
+		{{- end }}
 		return nil, fmt.Errorf(`unexpected type %T from directive, should be {{ .TypeReference.GO }}`, tmp)
 	{{- else -}}
 		ctx = rctx  // use context from middleware stack in children

codegen/input.gotpl

@@ -25,6 +25,10 @@
 					}
 					if data, ok := tmp.({{ $field.TypeReference.GO | ref }}) ; ok {
 						it.{{$field.GoFieldName}} = data
+					{{- if $field.TypeReference.IsNilable }}
+						} else if tmp == nil {
+							it.{{$field.GoFieldName}} = nil
+					{{- end }}
 					} else {
 						return it, fmt.Errorf(`unexpected type %T from directive, should be {{ $field.TypeReference.GO }}`, tmp)
 					}

codegen/testserver/directive.graphql

@@ -5,7 +5,7 @@ directive @logged(id: UUID!) on FIELD
 
 extend type Query {
     directiveArg(arg: String! @length(min:1, max: 255, message: "invalid length")): String
-    directiveNullableArg(arg: Int @range(min:0), arg2: Int @range): String
+    directiveNullableArg(arg: Int @range(min:0), arg2: Int @range): ObjectDirectives
     directiveInputNullable(arg: InputDirectives): String
     directiveInput(arg: InputDirectives!): String
     directiveInputType(arg: InnerInput! @custom): String
@@ -15,6 +15,7 @@ extend type Query {
 
 input InputDirectives {
     text: String! @length(min: 0, max: 7, message: "not valid")
+    nullableText: String @length(min: 0, max: 7, message: "not valid")
     inner: InnerDirectives!
     innerNullable: InnerDirectives
     thirdParty: ThirdParty @length(min: 0, max: 7)
@@ -23,3 +24,8 @@ input InputDirectives {
 input InnerDirectives {
     message: String! @length(min: 1, message: "not valid")
 }
+
+type ObjectDirectives {
+    text: String! @length(min: 0, max: 7, message: "not valid")
+    nullableText: String @length(min: 0, max: 7, message: "not valid")
+}