Exception when expanding node (#7456)

Fixes #7453

Author: alexr00

src/view/theme.ts

@@ -20,7 +20,7 @@ export async function loadCurrentThemeData(): Promise<ThemeData> {
 
 export interface ThemeData {
 	type: string,
-	colors: { [key: string]: string }
+	colors?: { [key: string]: string }
 	tokenColors: any[],
 	semanticTokenColors: any[]
 }
@@ -72,17 +72,17 @@ function getCurrentThemePaths(themeName: string): vscode.Uri | undefined {
 }
 
 export function getIconForeground(themeData: ThemeData, kind: 'light' | 'dark'): string {
-	return themeData.colors['icon.foreground'] ?? (kind === 'dark' ? '#C5C5C5' : '#424242');
+	return (themeData.colors ? themeData.colors['icon.foreground'] : undefined) ?? (kind === 'dark' ? '#C5C5C5' : '#424242');
 }
 
 export function getListWarningForeground(themeData: ThemeData, kind: 'light' | 'dark'): string {
-	return themeData.colors['list.warningForeground'] ?? (kind === 'dark' ? '#CCA700' : '#855F00');
+	return (themeData.colors ? themeData.colors['list.warningForeground'] : undefined) ?? (kind === 'dark' ? '#CCA700' : '#855F00');
 }
 
 export function getListErrorForeground(themeData: ThemeData, kind: 'light' | 'dark'): string {
-	return themeData.colors['list.errorForeground'] ?? (kind === 'dark' ? '#F88070' : '#B01011');
+	return (themeData.colors ? themeData.colors['list.errorForeground'] : undefined) ?? (kind === 'dark' ? '#F88070' : '#B01011');
 }
 
 export function getNotebookStatusSuccessIconForeground(themeData: ThemeData, kind: 'light' | 'dark'): string {
-	return themeData.colors['notebookStatusSuccessIcon.foreground'] ?? (kind === 'dark' ? '#89D185' : '#388A34');
+	return (themeData.colors ? themeData.colors['notebookStatusSuccessIcon.foreground'] : undefined) ?? (kind === 'dark' ? '#89D185' : '#388A34');
 }