Add block to handle null task payload in pull queue REST sample (#212)
Add block to handle null task payload in pull queue REST sample (#212)

* Replaced queue.xml with queue.yaml

* Add block to handle null payload

jetty-project/java-docs-samples,ErinJoan/mostly_empty_directory,tswast/java-docs-samples,GoogleCloudPlatform/java-docs-samples,ErinJoan/mostly_empty_directory,tswast/java-docs-samples,jetty-project/java-docs-samples,tswast/java-docs-samples,tswast/java-docs-samples,ErinJoan/mostly_empty_directory,GoogleCloudPlatform/java-docs-samples,jetty-project/java-docs-samples,GoogleCloudPlatform/java-docs-samples,GoogleCloudPlatform/java-docs-samples,GoogleCloudPlatform/java-docs-samples,jetty-project/java-docs-samples,ErinJoan/mostly_empty_directory,GoogleCloudPlatform/java-docs-samples,jetty-project/java-docs-samples