Distinguish between tree and blob paths

The assumption here is that if `git ls-files <file>` returns more than
one line for a given `<file>` that this means the file is a tree, but if
it only returns one line then the file is a blob.

Author: mvanderkamp

autoload/fugitive.vim

@@ -2054,9 +2054,13 @@ function! s:PathInfo(url) abort
       return [-1, '000000', '', '', -1]
     endif
     let newftime = getftime(fugitive#Find('.git/index', dir))
-    let [info, filename] = split(lines[0], "\t")
-    let [mode, sha, stage] = split(info, '\s\+')
-    let entry = [newftime, mode, 'blob', sha, -2]
+    if len(lines) > 1
+      let entry = [newftime, '040000', 'tree', '', -1]
+    else
+      let [info, filename] = split(lines[0], "\t")
+      let [mode, sha, stage] = split(info, '\s\+')
+      let entry = [newftime, mode, 'blob', sha, -2]
+    endif
   else
     let [tree, ftime] = s:TreeInfo(dir, commit)
     let entry = get(tree, path, [])