fix tests for normalize_dir

lib/gollum/blob_entry.rb

@@ -67,9 +67,10 @@ module Gollum
     # Returns a normalized String directory name, or nil if no directory
     # is given.
     def self.normalize_dir(dir)
+      return '' if dir =~ /^.:\/$/
       if dir
         dir = ::File.expand_path(dir, '/')
-        dir = '' if (dir == '/' || dir =~ /^.:\/$/)
+        dir = '' if dir == '/'
       end
       dir
     end

test/test_page.rb

@@ -139,6 +139,7 @@ context "Page" do
     assert_equal "", Gollum::BlobEntry.normalize_dir("")
     assert_equal "", Gollum::BlobEntry.normalize_dir(".")
     assert_equal "", Gollum::BlobEntry.normalize_dir("/")
+    assert_equal "", Gollum::BlobEntry.normalize_dir("c:/")
     assert_equal "/foo", Gollum::BlobEntry.normalize_dir("foo")
     assert_equal "/foo", Gollum::BlobEntry.normalize_dir("/foo")
   end