[fix]修复ol webmap添加没有serverId的图层时，阻断了后面layer的添加的问题 review by luox

Author: chenxianhuii

src/openlayers/mapping/WebMap.js

@@ -1983,7 +1983,7 @@ export class WebMap extends Observable {
             await that.addLayer(layer, null, layerIndex);
             that.layerAdded++;
             that.sendMapToUser(len);
-            return;
+            continue;
           }
           if (
             layer.layerType === 'MARKER' ||

test/openlayers/mapping/WebMapSpec.js

@@ -1940,5 +1940,25 @@ describe('openlayers_WebMap', () => {
             }, 500);
         }
     });
+      it('datavizWebMap_noServerIdMarker', (done) => {
+        let options = {
+          server: server,
+          webMap: defaultServeRequest,
+          successCallback,
+          errorCallback: function () { }
+        };
+        spyOn(FetchRequest, 'get').and.callFake((url) => {
+            if (url.indexOf('map.json') > -1) {
+                var mapJson = datavizWebMap_noServerIdMarker;
+                return Promise.resolve(new Response(mapJson));
+            }
+            return Promise.resolve();
+        });
+        var datavizWebmap = new WebMap(options);
+        function successCallback() {
+          expect(datavizWebmap.server).toBe(server);
+          done();
+        }
+      });
 
 });