Improve guard so it works for no eof new line

syntax/Jenkinsfile.vim

@@ -1,4 +1,5 @@
 if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'jenkins') == -1
+
 runtime syntax/groovy.vim
 syn keyword jenkinsfileBuiltInVariable currentBuild
 
@@ -125,4 +126,5 @@ hi link jenkinsFileDockerKeyword     jenkinsfilePipelineStep
 let b:current_syntax = 'Jenkinsfile'
 
 " vim:set et sw=0 ts=2 ft=vim tw=78:
+
 endif