Missing workspace prevents start of vscode (fixes #35871)

src/vs/platform/workspaces/electron-main/workspacesMainService.ts

@@ -70,7 +70,14 @@ export class WorkspacesMainService implements IWorkspacesMainService {
 			return null; // does not look like a valid workspace config file
 		}
 
-		return this.doResolveWorkspace(path, readFileSync(path, 'utf8'));
+		let contents: string;
+		try {
+			contents = readFileSync(path, 'utf8');
+		} catch (error) {
+			return null; // invalid workspace
+		}
+
+		return this.doResolveWorkspace(path, contents);
 	}
 
 	private isWorkspacePath(path: string): boolean {