Regenerate only the ApiInvoker.java file in the sample

Author: estiller

samples/client/petstore/android-java/src/main/java/io/swagger/client/ApiInvoker.java

@@ -365,8 +365,10 @@ else if ("PATCH".equals(method)) {
 
       int code = response.getStatusLine().getStatusCode();
       String responseString = null;
-      if(code == 204)
+      if(code == 204) {
         responseString = "";
+		return responseString;
+	  }
       else if(code >= 200 && code < 300) {
         if(response.getEntity() != null) {
           HttpEntity resEntity = response.getEntity();