Fix data resolution for entity count datasource type.

@@ -60,6 +60,16 @@ export class EntityDataService {
   constructor(private telemetryService: TelemetryWebsocketService,
               private utils: UtilsService) {}
 
+  private static isUnresolvedDatasource(datasource: Datasource, pageLink: EntityDataPageLink): boolean {
+    if (datasource.type === DatasourceType.entity) {
+      return !datasource.entityFilter || !pageLink;
+    } else if (datasource.type === DatasourceType.entityCount) {
+      return !datasource.entityFilter;
+    } else {
+      return false;
+    }
+  }
+
   public prepareSubscription(listener: EntityDataListener,
                              ignoreDataUpdateOnIntervalTick = false): Observable<EntityDataLoadResult> {
     const datasource = listener.configDatasource;
@@ -71,7 +81,7 @@ export class EntityDataService {
       null,
       false,
       ignoreDataUpdateOnIntervalTick);
-    if (datasource.type === DatasourceType.entity && (!datasource.entityFilter || !datasource.pageLink)) {
+    if (EntityDataService.isUnresolvedDatasource(datasource, datasource.pageLink)) {
       return of(null);
     }
     listener.subscription = new EntityDataSubscription(listener, this.telemetryService, this.utils);
@@ -100,7 +110,7 @@ export class EntityDataService {
       keyFilters,
       true,
       ignoreDataUpdateOnIntervalTick);
-    if (datasource.type === DatasourceType.entity && (!datasource.entityFilter || !pageLink)) {
+    if (EntityDataService.isUnresolvedDatasource(datasource, pageLink)) {
       listener.dataLoaded(emptyPageData<EntityData>(), [],
         listener.configDatasourceIndex, listener.subscriptionOptions.pageLink);
       return of(null);

@@ -271,19 +271,27 @@ export class EntityAutocompleteComponent implements ControlValueAccessor, OnInit
         );
       } else {
         const targetEntityType = this.checkEntityType(value.entityType);
-        this.entityService.getEntity(targetEntityType, value.id, {ignoreLoading: true, ignoreErrors: true}).subscribe(
-          (entity) => {
-            this.modelValue = entity.id.id;
-            this.selectEntityFormGroup.get('entity').patchValue(entity, {emitEvent: false});
-          },
-          () => {
-            this.modelValue = null;
-            this.selectEntityFormGroup.get('entity').patchValue('', {emitEvent: false});
-            if (value !== null) {
-              this.propagateChange(this.modelValue);
+        if (value.id) {
+          this.entityService.getEntity(targetEntityType, value.id, {ignoreLoading: true, ignoreErrors: true}).subscribe(
+            (entity) => {
+              this.modelValue = entity.id.id;
+              this.selectEntityFormGroup.get('entity').patchValue(entity, {emitEvent: false});
+            },
+            () => {
+              this.modelValue = null;
+              this.selectEntityFormGroup.get('entity').patchValue('', {emitEvent: false});
+              if (value !== null) {
+                this.propagateChange(this.modelValue);
+              }
             }
+          );
+        } else {
+          this.modelValue = null;
+          this.selectEntityFormGroup.get('entity').patchValue('', {emitEvent: false});
+          if (value !== null) {
+            this.propagateChange(this.modelValue);
           }
-        );
+        }
       }
     } else {
       this.modelValue = null;

@@ -818,7 +818,7 @@ export function updateDatasourceFromEntityInfo(datasource: Datasource, entity: E
   };
   datasource.entityId = entity.id;
   datasource.entityType = entity.entityType;
-  if (datasource.type === DatasourceType.entity) {
+  if (datasource.type === DatasourceType.entity || datasource.type === DatasourceType.entityCount) {
     datasource.entityName = entity.name;
     datasource.entityLabel = entity.label;
     datasource.name = entity.name;