title: Solr Faceting - ignore fields with no value in facet counts
body: <p>I have an index where some documents are missing a value I am faceting on.  When I run my query, no matter what I do, I get back a count with a blank label for the documents which were empty.</p>
  
  <p>I'm using solrj to query and receive XML back where the element for the empty facet field is present - for example </p>
  
  <p>I do not want to have a a facet count returned back for these empty fields.  I've tried setting facet.missing=false but I still have the count returned.</p>
  
  <p>Does anyone know how to stop this through Solr?  I really want to avoid putting in any logic into my views and to avoid any overhead there is for Solr when counting these.</p>
  
  <p>Thanks</p>