caught an errant comma. put it in its place.

Author: chriswarren

lib/rails_datatables.rb

@@ -45,7 +45,7 @@ def datatable(columns, opts={})
           "aoColumns": [
       			#{formatted_columns(columns)}
       				],
-      		#{"'fnRowCallback': function( nRow, aData, iDisplayIndex ) { #{row_callback} }" if row_callback},
+      		#{"'fnRowCallback': function( nRow, aData, iDisplayIndex ) { #{row_callback} }," if row_callback}
           "fnServerData": function ( sSource, aoData, fnCallback ) {
             aoData.push( #{additional_data_string} );
             $.getJSON( sSource, aoData, function (json) {