Python 3 transition comment

openlp/core/utils/__init__.py

@@ -404,6 +404,9 @@ def get_natural_key(string):
     """
     key = DIGITS_OR_NONDIGITS.findall(string)
     key = [int(part) if part.isdigit() else get_local_key(part) for part in key]
+    # Python 3 does not support comparision of different types anymore. So make sure, that we do not compare str and int.
+    #if string[0].isdigit():
+    #    return [''] + key 
     return key