Profile: Joe H.

[wpv-filter-start hide="false"]
[wpv-filter-controls]
<div class="form-group">
    <label>[wpml-string context="wpv-views"]Select A Category[/wpml-string]</label>
    [wpv-control-post-taxonomy taxonomy="category" type="select" url_param="wpv-listing-category"]
</div>
<div class="form-group">
    <label>[wpml-string context="wpv-views"]Select A Location[/wpml-string]</label>
    [wpv-control-post-taxonomy taxonomy="location" type="select" url_param="wpv-location"]
</div>[/wpv-filter-controls]
[wpv-filter-end]

add_filter( 'wpv_filter_query', 'drop_empty_search_query', 10, 3 );
function drop_empty_search_query( $query_args, $view_settings, $view_id ) {
    $ids = array(1, 2, 3);
    if (in_array($view_id, $ids)){
      if (
        // taxonomy filter needs to check for not '0' as well as not empty
        ( isset($_GET['wpv-listing-category']) && $_GET['wpv-listing-category'] != '0' )
          ||
        // taxonomy filter needs to check for not '0' as well as not empty
        ( isset($_GET['wpv-location']) && $_GET['wpv-location'] != '0' )
          ||
        // text search only needs to check for not empty
        ( isset($_GET['wpv_post_search']) && $_GET['wpv_post_search'] != '' )
      ) {
      } else {
        $query_args['post__in'] = array(0);
      }
    }
    return $query_args;
}