Avoids creating needless deferred

Author: eamodio

src/views/scmGroupedView.ts

@@ -80,8 +80,8 @@ export class ScmGroupedView implements Disposable {
 		if (!destroyTree) {
 			// Force a "refresh" of the tree to blank it out
 			this._cleared?.cancel();
-			this._cleared = defer<void>();
 			if (this._tree?.visible) {
+				this._cleared = defer<void>();
 				this._onDidChangeTreeData?.fire(undefined);
 				await this._cleared.promise.catch(() => {}).finally(() => (this._cleared = undefined));
 			}