fix direction

apps/backend/src/issues/issues.controller.ts

@@ -33,11 +33,11 @@ export class IssuesController {
   }
 
   @Get()
-  findAll(@Param('direction') direction: string) {
+  findAll(@Param('direction') direction?: string) {
     return this.issuesService
       .findAll(
-        direction.toLowerCase() === 'desc' ||
-          direction.toLowerCase() === 'descending',
+        direction?.toLowerCase() === 'desc' ||
+          direction?.toLowerCase() === 'descending',
       )
       .then((r) => r.map((i) => i.toDto()));
   }