fix null check

Author: yannbf

src/util/getStorybookMetadata.ts

@@ -25,7 +25,7 @@ export const getStorybookMetadata = async () => {
   const lazyCompilation = !!main.core?.builder?.options?.lazyCompilation;
 
   const frameworkName =
-    main.framework && typeof main.framework === 'string' ? main.framework : main.framework.name;
+    main.framework && typeof main.framework === 'string' ? main.framework : main.framework?.name;
 
   const { disableTelemetry, enableCrashReports } = main.core || {};