#349318, reported by jeeves: Fix empty map being displayed for 0.00,0.00 locations.

gmap_location.module

@@ -672,7 +672,7 @@ function gmap_location_block_view($nid) {
     $count = 0;
     foreach ($node->locations as $loc) {
       // @@@ Todo: Client side geocoding
-      if ($loc['latitude'] || $loc['longitude']) {
+      if (location_has_coordinates($loc)) {
         $count++;
         $markername = isset($markertypes[$node->type]) ? $markertypes[$node->type] : 'drupal';
         if (module_exists('gmap_taxonomy')) {