Você pode usar este teste simples:
WHERE (requires = 'privacy-weight' AND privacy-weight = 0) OR requires <> 'privacy-weight' OR requires IS NULL
A primeira parte
(requires = 'privacy-weight' AND privacy-weight = 0) impede a saída de:privacy-weight | requires
-------------------------
1 | privacy-weight
Mas mantém:
privacy-weight | requires
-------------------------
0 | privacy-weight
Enquanto a segunda parte
OR requires <> 'privacy-weight' OR requires IS NULL manterá os seguintes:privacy-weight | requires
-------------------------
0 | NULL
1 | NULL
1 | NULL
