title: ssrs parameter and applying blank value
body: <p>I'm fairly new to SSRS, and I'm coming across a small glitch.
  I have set three parameters to the report: x, y, and date. I allowed x and y to be blank value ("") by checking off the box under value in parameter properties. </p>
  
  <p>When I try to search just x and date however, the report returns blank with just the headers. Same thing for y and date. It's only when I completely fill out the three parameters that the report shows up. Can anyone tell me why my blank value for both x and y parameters is not working?</p>