Python の組み込み関数の str.stritp() が空白文字の削除なのでそれをうまく適用すればよい。
'\n'.join(filter(lambda x: x.strip(), text.split('\n')))
抽出する行の余分な空白文字も削除したい場合
'\n'.join(filter(lambda x: x.strip(), map(lambda x: x.strip(), text.split('\n'))))
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