check whether bundle installed

- just by checking content

Conflicts:

	autoload/vundle/installer.vim

autoload/vundle/config.vim

@@ -85,6 +85,10 @@ func! s:bundle.nosync()
   return has_key(self, 'sync') && 'no' == self.sync()
 endf
 
+func! s:bundle.installed()
+  return !empty(split(globpath(self.path(), '*'), "\n"))
+endf
+
 func! s:bundle.path()
   if self.nosync()
     if isdirectory(expand(self.uri))

autoload/vundle/installer.vim

@@ -61,10 +61,14 @@ func! s:helptags(rtp) abort
   helptags `=a:rtp.'/doc/'`
 endf
 
+
+func! s:installed(bundle) abort
+  return !empty(split(globpath(a:bundle.path(), '*'), "\n"))
+endf
+
 func! s:sync(bang, bundle) abort
   if a:bundle.nosync() | return 0 | endif
-  let git_dir = expand(a:bundle.path().'/.git')
-  if isdirectory(git_dir)
+  if a:bundle.installed()
     if !(a:bang) | return 0 | endif
     let cmd = 'cd '.shellescape(a:bundle.path()).' && git pull'
   else