If a zip file is uploaded, extract any images from it and add
        them to the gallery, before removing the zip file.

def save(self, delete_zip_import=True, *args, **kwargs):
        """
        If a zip file is uploaded, extract any images from it and add
        them to the gallery, before removing the zip file.
        """
        super(BaseGallery, self).save(*args, **kwargs)
        if self.zip_import:
            zip_file = ZipFile(self.zip_import)
            for name in zip_file.namelist():
                data = zip_file.read(name)
                try:
                    from PIL import Image
                    image = Image.open(BytesIO(data))
                    image.load()
                    image = Image.open(BytesIO(data))
                    image.verify()
                except ImportError:
                    pass
                except:
                    continue
                name = os.path.split(name)[1]

                # In python3, name is a string. Convert it to bytes.
                if not isinstance(name, bytes):
                    try:
                        name = name.encode('cp437')
                    except UnicodeEncodeError:
                        # File name includes characters that aren't in cp437,
                        # which isn't supported by most zip tooling. They will
                        # not appear correctly.
                        tempname = name

                # Decode byte-name.
                if isinstance(name, bytes):
                    encoding = charsetdetect(name)['encoding']
                    tempname = name.decode(encoding)

                # A gallery with a slug of "/" tries to extract files
                # to / on disk; see os.path.join docs.
                slug = self.slug if self.slug != "/" else ""
                path = os.path.join(GALLERIES_UPLOAD_DIR, slug, tempname)
                try:
                    saved_path = default_storage.save(path, ContentFile(data))
                except UnicodeEncodeError:
                    from warnings import warn
                    warn("A file was saved that contains unicode "
                         "characters in its path, but somehow the current "
                         "locale does not support utf-8. You may need to set "
                         "'LC_ALL' to a correct value, eg: 'en_US.UTF-8'.")
                    # The native() call is needed here around str because
                    # os.path.join() in Python 2.x (in posixpath.py)
                    # mixes byte-strings with unicode strings without
                    # explicit conversion, which raises a TypeError as it
                    # would on Python 3.
                    path = os.path.join(GALLERIES_UPLOAD_DIR, slug,
                                        native(str(name, errors="ignore")))
                    saved_path = default_storage.save(path, ContentFile(data))
                self.images.create(file=saved_path)
            if delete_zip_import:
                zip_file.close()
                self.zip_import.delete(save=True)