Postgres: For template queries return [] and not error (#38060)

* Postgres: For template queries return [] and not error

* remove the console error

* update mssql and mysql

Co-authored-by: Ying WANG <ying.wang@grafana.com>

CONTRIBUTING.md

@@ -26,10 +26,12 @@ Report a bug by submitting a [bug report](https://github.com/grafana/grafana/iss
 Follow the issue template and add additional information that will help us replicate the problem.
 
 For data visualization issues:
+
 - Query results from the inspect drawer (data tab & query inspector)
 - Panel settings can be extracted in the panel inspect drawer JSON tab
 
 For a dashboard related issues:
+
 - Dashboard JSON can be found in the dashboard settings JSON model view
 
 For authentication and alerting Grafana server logs are useful.

docs/README.md

@@ -25,6 +25,7 @@ Edit content in the `sources` directory.
 Use the Hugo shortcode [relref](https://gohugo.io/content-management/cross-references/#use-ref-and-relref) any time you are linking to other internal docs pages.
 
 Syntax is:
+
 ```
 {{< relref "example.md" >}}
 ```
@@ -57,7 +58,7 @@ Images are currently hosted in the grafana/website repo.
 
 When a PR is merged with changes in the `docs/sources` directory, those changes are automatically synced by a GitHub action (`.github/workflows/publish.yml`) to the grafana/website repo.
 
-* A PR that targets the `main` branch syncs to the `content/docs/grafana/next` directory in the `website` repository, and publishes to `https://grafana.com/docs/grafana/next/`.
+- A PR that targets the `main` branch syncs to the `content/docs/grafana/next` directory in the `website` repository, and publishes to `https://grafana.com/docs/grafana/next/`.
-* A PR targeting the `latest/current` release branch syncs to the `content/docs/grafana/latest` directory in the `website` repository, and publishes to `https://grafana.com/docs/grafana/latest/`.
+- A PR targeting the `latest/current` release branch syncs to the `content/docs/grafana/latest` directory in the `website` repository, and publishes to `https://grafana.com/docs/grafana/latest/`.
 
 Once the sync is complete, the website will automatically publish to production - no further action is needed.

public/app/plugins/datasource/mssql/datasource.ts

@@ -147,6 +147,9 @@ export class MssqlDatasource extends DataSourceWithBackend<MssqlQuery, MssqlOpti
         .pipe(
           map((rsp) => {
             return this.responseParser.transformMetricFindResponse(rsp);
+          }),
+          catchError((err) => {
+            return of([]);
           })
         )
     );

public/app/plugins/datasource/mysql/datasource.ts

@@ -157,6 +157,9 @@ export class MysqlDatasource extends DataSourceWithBackend<MySQLQuery, MySQLOpti
         .pipe(
           map((rsp) => {
             return this.responseParser.transformMetricFindResponse(rsp);
+          }),
+          catchError((err) => {
+            return of([]);
           })
         )
     );

public/app/plugins/datasource/postgres/datasource.ts

@@ -1,6 +1,6 @@
 import { map as _map } from 'lodash';
-import { lastValueFrom } from 'rxjs';
+import { lastValueFrom, of } from 'rxjs';
-import { map } from 'rxjs/operators';
+import { map, catchError } from 'rxjs/operators';
 import { BackendDataSourceResponse, DataSourceWithBackend, FetchResponse, getBackendSrv } from '@grafana/runtime';
 import { AnnotationEvent, DataSourceInstanceSettings, MetricFindValue, ScopedVars } from '@grafana/data';
 
@@ -159,6 +159,9 @@ export class PostgresDatasource extends DataSourceWithBackend<PostgresQuery, Pos
         .pipe(
           map((rsp) => {
             return this.responseParser.transformMetricFindResponse(rsp);
+          }),
+          catchError((err) => {
+            return of([]);
           })
         )
     );