fix null pointer in batchConversionMarkers

Author: fuzhenn

src/map/Map.Camera.js

@@ -239,6 +239,10 @@ Map.include(/** @lends Map.prototype */{
         const centerPoint = this._prjToPoint(this._getPrjCenter(), undefined, TEMP_COORD);
         const pts = [];
         for (let i = 0, len = points.length; i < len; i++) {
+            if (!points[i]) {
+                pts.push(null);
+                continue;
+            }
             const point = points[i].copy()._multi(res);
             const altitude = altitudeIsArray ? (altitudes[i] || 0) : altitudes;
             this._toContainerPoint(point, isTransforming, res, altitude, centerPoint);

src/renderer/layer/vectorlayer/VectorLayerCanvasRenderer.js

@@ -283,6 +283,10 @@ class VectorLayerRenderer extends OverlayLayerCanvasRenderer {
         for (let i = 0, len = markers.length; i < len; i++) {
             const geo = markers[i];
             geo._cPoint = pts[i];
+            if (!geo._cPoint) {
+                geo._inCurrentView = false;
+                continue;
+            }
             const { x, y } = pts[i];
             //Is the point in view
             geo._inCurrentView = (x >= xmin && y >= ymin && x <= xmax && y <= ymax);