optional database name option (#17538)

* optional database name option

* object explorer connection title

* revert unexpected change

* bug fixes

src/sql/workbench/contrib/query/browser/queryActions.ts

@@ -791,6 +791,11 @@ export class ListDatabasesActionItem extends Disposable implements IActionViewIt
 	}
 
 	private updateConnection(databaseName: string): void {
+		// Ignore if the database name is not provided, this happens when the query editor connection is changed to
+		// a provider that does not support database.
+		if (!databaseName) {
+			return;
+		}
 		this._isConnected = true;
 		this._currentDatabaseName = databaseName;
 		// Set the value immediately to the initial database so the user can see that, and then