question about dict2pb function

[sumtiogo]

for field in obj.DESCRIPTOR.fields:
    if not field.label == field.LABEL_REQUIRED:
        continue
    if not field.has_default_value:
        continue
    if not field.name in adict:
        raise ConvertException(
            'Field "%s" missing from descriptor dictionary.'
            % field.name)

I have question about the second if statement

if not field.has_default_value:
continue

does this loop meant to check:
if there is a filed which is labeled require but without default value, then the filed.name must be the key in adict.

if so, maybe we should change this if statement to:

if not field.has_default_value:
continue

If I misunderstand anything, please let me know.
Thanks a lot.

[sumtiogo]

In other word, if a filed is required but without default value, it seems the exception will never be raised