Output all columns

Summary

Looking for guidance on adjusting our SQL statement

Content

Good afternoon, 

We're trying to output a specific report column, even if there is no user data input.  Right now, the SQL below is basically saying not to output anything if there is no user data, which causes the report to remove the column if none of the users in a specific timeframe fill out a certain field.  We'd like to output the column every time the report runs, regardless of user input.  So far we've tried using ">=," outputting just the question_responses.text_answer, and inserting ' ' in the else condition.  None seem to get us the result we are seeking.  Any help is