Update DefaultGenerator.java (#4760)

Author: soulfly

modules/swagger-codegen/src/main/java/io/swagger/codegen/DefaultGenerator.java

@@ -154,8 +154,10 @@ private void configureSwaggerInfo() {
             // set a default description if none if provided
             config.additionalProperties().put("appDescription",
                     "No description provided (generated by Swagger Codegen https://github.com/swagger-api/swagger-codegen)");
+            config.additionalProperties().put("unescapedAppDescription", "No description provided (generated by Swagger Codegen https://github.com/swagger-api/swagger-codegen)");
         } else {
             config.additionalProperties().put("appDescription", config.escapeText(info.getDescription()));
+            config.additionalProperties().put("unescapedAppDescription", info.getDescription());
         }
 
         if (info.getContact() != null) {