test(files): fix external-URL assertion to handle undefined error

Author: waleedlatif1

apps/sim/app/api/files/parse/route.test.ts

@@ -821,7 +821,9 @@ describe('Files Parse API - Path Traversal Security', () => {
       const response = await POST(request)
       const result = await response.json()
 
-      expect(result.error).not.toMatch(/Access denied: path traversal detected/)
+      expect(result.error ?? '').not.toContain('path traversal detected')
+      // The URL reaching the pinned fetch proves it passed validation and routed
+      // to external-URL handling rather than being rejected as a local path.
       expect(inputValidationMockFns.mockSecureFetchWithPinnedIP).toHaveBeenCalledWith(
         slackUrl,
         '203.0.113.10',