Merge pull request #13860 from ahocevar/geojson-empty-coordinate-arrays

Handle multipolygons with empty polygons

src/ol/geom/flat/deflate.js

@@ -94,6 +94,9 @@ export function deflateMultiCoordinatesArray(
       stride,
       endss[i]
     );
+    if (ends.length === 0) {
+      ends[0] = offset;
+    }
     endss[i++] = ends;
     offset = ends[ends.length - 1];
   }

src/ol/geom/flat/inflate.js

@@ -79,13 +79,16 @@ export function inflateMultiCoordinatesArray(
   let i = 0;
   for (let j = 0, jj = endss.length; j < jj; ++j) {
     const ends = endss[j];
-    coordinatesss[i++] = inflateCoordinatesArray(
-      flatCoordinates,
-      offset,
-      ends,
-      stride,
-      coordinatesss[i]
-    );
+    coordinatesss[i++] =
+      ends.length === 1 && ends[0] === offset
+        ? []
+        : inflateCoordinatesArray(
+            flatCoordinates,
+            offset,
+            ends,
+            stride,
+            coordinatesss[i]
+          );
     offset = ends[ends.length - 1];
   }
   coordinatesss.length = i;