وَ«لَا فِي الدَّارِ رَجُلٌ وَلَا امْرَأَةٌ».
Translation: And: There is neither a man nor a woman in the house.
«لَا فِي الدَّارِ رَجُلٌ وَلَا امْرَأَةٌ»: the prepositional phrase fī l-dāri intervenes between lā and the noun.
That separation prevents the special construction: rajulun is nominative, not built on fatḥ as the direct noun of lā.
The source also repeats lā.
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Ism Inna and the Noun Governed by Lā of Generic Negation
وَ«لَا فِي الدَّارِ رَجُلٌ وَلَا امْرَأَةٌ».
Translation: And: There is neither a man nor a woman in the house.
«لَا فِي الدَّارِ رَجُلٌ وَلَا امْرَأَةٌ»: the prepositional phrase fī l-dāri intervenes between lā and the noun.
That separation prevents the special construction: rajulun is nominative, not built on fatḥ as the direct noun of lā.
The source also repeats lā.