writer_png_Export seems not generating a good result from cloudooo in LibreOffice 4.3.3.2.

cloudooo/handler/ooo/mimemapper.py

@@ -136,6 +136,7 @@ class MimeMapper(object):
 
     ooo_disable_filter_list = kw.get("ooo_disable_filter_list") or [] + [
         'writer_jpg_Export', # Seems not working from cloudooo in Libre Office 4.3.3.2
+        'writer_png_Export', # Seems not working from cloudooo in Libre Office 4.3.3.2
     ]
     ooo_disable_filter_name_list = kw.get("ooo_disable_filter_name_list") or [] + [
         'Text', # Use 'Text - Choose Encoding' instead