Map command shows results only when the second query have value

Hi Splunkers, I have first query which produces 50 results, am using map command to run different query for each 50 results of first query and getting values, but when map command search query doesn't have any value from first query it ignores it. Hence shows only 20 results but i was final output should be 50 results, if there is no value in second query it can be null. Anyone have idea how to do it? Thanks in advance.