fix: fallback to empty string if there are no attributes (#397)

Fixes #396

Co-authored-by: Simon Holthausen <simon.holthausen@accso.de>

src/transformers/typescript.ts

@@ -77,7 +77,7 @@ function getScriptContent(markup: string, module: boolean): string {
   let match: RegExpMatchArray | null;
 
   while ((match = regex.exec(markup)) !== null) {
-    const { context } = parseAttributes(match[1]);
+    const { context } = parseAttributes(match[1] || '');
 
     if ((context !== 'module' && !module) || (context === 'module' && module)) {
       return match[2];