Revert "Only show hg qtop output, if branch is also shown"

This reverts commit da78d4a7bb,
since it causes a massive performance impact.

fixes #1035

autoload/airline/extensions/branch.vim

@@ -102,13 +102,12 @@ endfunction
 
 function! s:get_hg_branch()
   if s:has_lawrencium
-    let stl=lawrencium#statusline()
     let mq=system('hg qtop')
-    if v:shell_error==0 && !empty(stl)
-      let mq=matchstr(mq, '.*\ze\n') 
-      return printf("%s/%s", stl, mq)
+    if v:shell_error==0
+      let mq=matchstr(mq, '.*\ze\n')
+      return lawrencium#statusline(). '/'. mq
     endif
-    return stl
+    return lawrencium#statusline()
   endif
   return ''
 endfunction