Main method returning block contents (static or dynamic).

def get(self, block_alias, context):
        """Main method returning block contents (static or dynamic)."""
        contents = []

        dynamic_block_contents = self.get_contents_dynamic(block_alias, context)
        if dynamic_block_contents:
            contents.append(dynamic_block_contents)

        static_block_contents = self.get_contents_static(block_alias, context)
        if static_block_contents:
            contents.append(static_block_contents)

        if not contents:
            return ''

        return choice(contents)