CClosure.unfold_projection: don't catch Not_found, assume env is ok
CClosure.unfold_projection: don't catch Not_found, assume env is ok

We can do this after the parent commit (Reductionops.nf_* don't use
empty env)

ejgallego/coq,gares/coq,JasonGross/coq,ejgallego/coq,gares/coq,ejgallego/coq,ppedrot/coq,SkySkimmer/coq,Zimmi48/coq,JasonGross/coq,Matafou/coq,gares/coq,coq/coq,gares/coq,JasonGross/coq,letouzey/coq-wip,SkySkimmer/coq,letouzey/coq-wip,letouzey/coq-wip,maximedenes/coq,Matafou/coq,coq/coq,letouzey/coq-wip,ppedrot/coq,gares/coq,JasonGross/coq,SkySkimmer/coq,coq/coq,Zimmi48/coq,maximedenes/coq,ppedrot/coq,ppedrot/coq,letouzey/coq-wip,ejgallego/coq,maximedenes/coq,SkySkimmer/coq,coq/coq,silene/coq,ppedrot/coq,Zimmi48/coq,Matafou/coq,maximedenes/coq,silene/coq,silene/coq,maximedenes/coq,Zimmi48/coq