def clean_tags(self):
        project_tags_list = self.cleaned_data['tags']
        tags = list(set([tag.strip() for tag in project_tags_list.split(',')])) or []
        for i in tags:
            if not i.strip():
                tags.remove(i)
        tags.append(u'')
        project_tags_list = ', '.join(tags)
        return project_tags_list
dataset/ETHPy150Open rvanlaar/easy-transifex/src/transifex/transifex/projects/forms.py/ProjectForm.clean_tags/original