test for getElementSet when element_set_id is nll
test for getElementSet when element_set_id is nll

scholarslab/SolrSearch,CATCH-FACT/SolrSearch-VB,scholarslab/SolrSearch,anuragji/SolrSearch,micongrin/plugin_SolrSearch-WMI,micongrin/plugin_SolrSearch-WMI,micongrin/plugin_SolrSearch-WMI,anuragji/SolrSearch,CATCH-FACT/SolrSearch-VB,anuragji/SolrSearch,scholarslab/SolrSearch,scholarslab/SolrSearch,CATCH-FACT/SolrSearch-VB,CATCH-FACT/SolrSearch-VB,anuragji/SolrSearch