Output empty strings for unused %evtprm() variables

Feature request: When outputting variables' values to a task (i.e., adding a row to a Google sheet or text file), instead of outputting "%evtprm8" if %evtprm8 is empty (as an example), output an empty or null string.

When I use the Google Sheets plug-in and when I export to text file as CSV, whenever Tasker encounters a variable with an empty value it outputs the name of the variable instead of null or empty value.