Add link to ticket on 404 page

app/views/statistics/vulnerabilityNotFound.scala.html

@@ -2,7 +2,8 @@
 @(
     projectsWithSelection: ProjectsWithSelection,
     name: String,
-    failedProjects: FailedProjects
+    failedProjects: FailedProjects,
+    issueOption: Option[(ExportedVulnerability[String], String)]
 )(implicit header: DefaultRequest)
 
 @main(
@@ -19,6 +20,9 @@
                 <a class="btn btn-success" href="@routes.Statistics.vulnerability(name, None)">Look at all the projects!</a>
             </li>
         }
+        @for((ticket, issueLink) <- issueOption){
+            <li>See the <a href="@issueLink">related ticket @ticket.ticket</a>.</li>
+        }
         <li>
             Maybe the vulnerability does not affect any of the projects.<br>
             <a href="https://web.nvd.nist.gov/view/vuln/detail?vulnId=@helper.urlEncode(name)" class="btn btn-default">Look at NVD</a>