Where is the source data?
I have an idea.
Please copy and paste into qvw file and reload
LOAD * INLINE [
Have Name as your dimension and value as your expression, this will give you your extra blank row.
Also, when you load your qvd file (assume qvd is used) just concatenate exact same field names but the value will be quote (' '). To achieve optimization I will have this stored in qvd file and just concatenate it to any table in where I want to the extra field as blank.
Give it a try and let us know the outcome.