Fix github issues for oneOf in schema

Author: devlikepro

src/openapi/RefResolver.ts

@@ -11,6 +11,10 @@ export class RefResolver {
      * @param schema
      */
     resolveRef<T>(schema: OpenAPIV3.ReferenceObject | T): [T, string[]?] {
+        // @ts-ignore
+        if ("properties" in schema) {
+            return [schema as T, undefined]
+        }
         // @ts-ignore
         if ("oneOf" in schema) {
             // @ts-ignore