Fix error in dispose from telemetry (microsoft#184957)

Author: roblourens

src/vs/workbench/contrib/debug/browser/repl.ts

@@ -753,7 +753,7 @@ export class Repl extends FilterViewPane implements IHistoryNavigationWidget {
 	}
 
 	override dispose(): void {
-		this.replInput.dispose();
+		this.replInput?.dispose(); // Disposed before rendered? #174558
 		this.replElementsChangeListener?.dispose();
 		this.refreshScheduler.dispose();
 		this.modelChangeListener.dispose();