Fix incorrect file name on new or deleted empty files

Author: Patrick-Beuks

src/Gitonomy/Git/Parser/DiffParser.php

@@ -38,6 +38,7 @@ protected function doParse()
                 $newMode = $this->consumeTo("\n");
                 $this->consumeNewLine();
                 $oldMode = null;
+                $oldName = '/dev/null';
             }
             if ($this->expects('old mode ')) {
                 $oldMode = $this->consumeTo("\n");
@@ -49,6 +50,7 @@ protected function doParse()
             if ($this->expects('deleted file mode ')) {
                 $oldMode = $this->consumeTo("\n");
                 $newMode = null;
+                $newName = '/dev/null';
                 $this->consumeNewLine();
             }