[rust] fixed nullable byte arrays

Author: ranger-ross

modules/openapi-generator/src/main/resources/rust/model.mustache

@@ -129,9 +129,9 @@ pub struct {{{classname}}} {
     /// {{{.}}}
     {{/description}}
     {{#isByteArray}}
-    {{#required}}#[serde_as(as = "serde_with::base64::Base64")]{{/required}}{{^required}}#[serde_as(as = "Option<serde_with::base64::Base64>")]{{/required}}
+    {{#required}}#[serde_as(as = "serde_with::base64::Base64")]{{/required}}{{^required}}#[serde_as(as = "{{#isNullable}}Option<{{/isNullable}}Option<serde_with::base64::Base64>{{#isNullable}}>{{/isNullable}}")]{{/required}}
     {{/isByteArray}}
-    #[serde(rename = "{{{baseName}}}"{{^required}}{{#isNullable}}, default, with = "::serde_with::rust::double_option"{{/isNullable}}{{/required}}{{^required}}, skip_serializing_if = "Option::is_none"{{/required}}{{#required}}{{#isNullable}}, deserialize_with = "Option::deserialize"{{/isNullable}}{{/required}})]
+    #[serde(rename = "{{{baseName}}}"{{^required}}{{#isNullable}}, default{{^isByteArray}}, with = "::serde_with::rust::double_option"{{/isByteArray}}{{/isNullable}}{{/required}}{{^required}}, skip_serializing_if = "Option::is_none"{{/required}}{{#required}}{{#isNullable}}, deserialize_with = "Option::deserialize"{{/isNullable}}{{/required}})]
     pub {{{name}}}: {{!
     ### Option Start
     }}{{#isNullable}}Option<{{/isNullable}}{{^required}}Option<{{/required}}{{!