Prevent security test from failing build

Jenkinsfile

@@ -38,7 +38,6 @@ pipeline {
             }
         }
 
-        try{
         stage('Security scan') {
             when {
                 expression { 
@@ -46,6 +45,7 @@ pipeline {
                 }
             }
             steps {
+                catchError(buildResult: 'SUCCESS', stageResult: 'FAILURE') {
                     sh "docker kill sectest || true"
                     sh "docker rm sectest || true"
                     sh "docker run -d --name sectest git.jakecharman.co.uk/jake/jakecharman.co.uk:$BUILD_NUMBER"
@@ -56,10 +56,6 @@ pipeline {
                 }
             }
         }
-        catch(e) {
-            build_ok = false
-            echo e.toString()
-        }
 
         stage('Push to local registry') {
             when {