Update api.jl

close #491

Author: amontoison

src/nlp/api.jl

@@ -58,8 +58,18 @@ function cons!(nlp::AbstractNLPModel, x::AbstractVector, cx::AbstractVector)
   @lencheck nlp.meta.nvar x
   @lencheck nlp.meta.ncon cx
   increment!(nlp, :neval_cons)
-  nlp.meta.nlin > 0 && cons_lin!(nlp, x, view(cx, nlp.meta.lin))
-  nlp.meta.nnln > 0 && cons_nln!(nlp, x, view(cx, nlp.meta.nln))
+  if nlp.meta.nlin > 0
+    if nlp.meta.nnln > 0
+      cons_lin!(nlp, x, view(cx, nlp.meta.lin))
+      cons_nln!(nlp, x, view(cx, nlp.meta.nln))
+    else
+      cons_lin!(nlp, x, cx)
+    end
+  else
+    if nlp.meta.nnln > 0
+      cons_nln!(nlp, x, cx)
+    end
+  end
   return cx
 end