From da0838dde2de401274b4e5d38c6f000cb6d4cf11 Mon Sep 17 00:00:00 2001
From: ahocevar <andreas.hocevar@gmail.com>
Date: Sat, 7 Jul 2018 14:48:06 +0200
Subject: [PATCH] Treat WKT EMPTY geometries properly

Empty points have NaN as each coordinate, other geometry types have
empty arrays.
---
 src/ol/format/WKT.js | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/ol/format/WKT.js b/src/ol/format/WKT.js
index be01fc0174..fb3f33fc8f 100644
--- a/src/ol/format/WKT.js
+++ b/src/ol/format/WKT.js
@@ -858,7 +858,14 @@ Parser.prototype.parseGeometry_ = function() {
       if (!parser || !ctor) {
         throw new Error('Invalid geometry type: ' + geomType);
       }
-      const coordinates = parser.call(this);
+      let coordinates = parser.call(this);
+      if (!coordinates) {
+        if (ctor === GeometryConstructor[GeometryType.POINT]) {
+          coordinates = [NaN, NaN];
+        } else {
+          coordinates = [];
+        }
+      }
       return new ctor(coordinates, this.layout_);
     }
   }