Don't show empty list of DBs

Author: shati-patel

extensions/ql-vscode/src/extension.ts

@@ -571,6 +571,10 @@ async function activateWithInstalledDistribution(
         uri: Uri | undefined
       ) => {
         let filteredDBs = dbm.databaseItems;
+        if (filteredDBs.length === 0) {
+          void helpers.showAndLogErrorMessage('No databases found. Please add a suitable database to your workspace.');
+          return;
+        }
         // If possible, only show databases with the right language (otherwise show all databases).
         const queryLanguage = await findLanguage(cliServer, uri);
         if (queryLanguage) {

extensions/ql-vscode/src/run-remote-query.ts

@@ -71,7 +71,7 @@ export async function runRemoteQuery(cliServer: cli.CodeQLCliServer, credentials
   const repositories = config.repositories;
 
   if (!language) {
-    return;
+    return; // No error message needed, since `findlanguage` already displays one.
   }
 
   try {