Fix ls-files for git 2.16 (#350)

rafamanzo · rvodden · commit 5507d989db90 · 2018-03-28T12:44:59.000+01:00
Since GIT version 2.16.0 empty pathspecs as alias to "everything" has been made illegal. A more detailed study this change's impact has been made at: #345 (comment) Closes #345
diff --git a/lib/git/lib.rb b/lib/git/lib.rb
@@ -396,6 +396,7 @@ def diff_index(treeish)
     end
 
     def ls_files(location=nil)
+      location ||= '.'
       hsh = {}
       command_lines('ls-files', ['--stage', location]).each do |line|
         (info, file) = line.split("\t")
