[getTagKeys] Ensure we're not using suggestions when no scopes are present (#97353)

* Ensure we're not using suggestions when no scopes are present

* Simplify scopes check

Co-authored-by: Bogdan Matei <bogdan.matei@grafana.com>

---------

Co-authored-by: Bogdan Matei <bogdan.matei@grafana.com>

packages/grafana-prometheus/src/datasource.ts

@@ -620,7 +620,7 @@ export class PrometheusDatasource
   // it is used in metric_find_query.ts
   // and in Tempo here grafana/public/app/plugins/datasource/tempo/QueryEditor/ServiceGraphSection.tsx
   async getTagKeys(options: DataSourceGetTagKeysOptions<PromQuery>): Promise<MetricFindValue[]> {
-    if (config.featureToggles.promQLScope && !!options) {
+    if (config.featureToggles.promQLScope && (options?.scopes?.length ?? 0) > 0) {
       const suggestions = await this.languageProvider.fetchSuggestions(
         options.timeRange,
         options.queries,