According to Staudacher (2004: 53) predicate noun phrases can also occur without copula (example: Son papa en tayer. 'His father is a tailor.') However, I have not yet found an authentic example without copula. More research is needed.
Source: Staudacher-Valliamée 2004: 53
Source: Barat et al. 1977: 57
Source: Cellier 1982: 45
Source: Carayol et al. 1984-1995: 631N