[openstreetmap/openstreetmap-website] Query tool: hovering over relations sometimes unresponsive (#1608)

[mmd]

Suggested fix:

```javascript
diff --git a/app/assets/javascripts/index/query.js b/app/assets/javascripts/index/query.js
index 018aedf..7ac613d 100644
--- a/app/assets/javascripts/index/query.js
+++ b/app/assets/javascripts/index/query.js
@@ -146,7 +146,7 @@ OSM.Query = function(map) {
 
     if (feature.type === "node" && feature.lat && feature.lon) {
       geometry = L.circleMarker([feature.lat, feature.lon], featureStyle);
-    } else if (feature.type === "way" && feature.geometry) {
+    } else if (feature.type === "way" && feature.geometry && feature.geometry.length > 0) {
       geometry = L.polyline(feature.geometry.filter(function (point) {
         return point !== null;
       }).map(function (point) {

```

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