Workaround exception thrown on pty host

Fixes microsoft#222323

Author: Tyriar

src/vs/platform/terminal/node/terminalProcess.ts

@@ -401,7 +401,8 @@ export class TerminalProcess extends Disposable implements ITerminalChildProcess
 		if (this._store.isDisposed) {
 			return;
 		}
-		this._currentTitle = ptyProcess.process;
+		// HACK: The node-pty API can return undefined somehow https://github.com/microsoft/vscode/issues/222323
+		this._currentTitle = (ptyProcess.process ?? '');
 		this._onDidChangeProperty.fire({ type: ProcessPropertyType.Title, value: this._currentTitle });
 		// If fig is installed it may change the title of the process
 		const sanitizedTitle = this.currentTitle.replace(/ \(figterm\)$/g, '');