Fix initialization size to not try/catch

Author: ChrisRackauckas

src/initialize_dae.jl

@@ -528,9 +528,10 @@ function _initialize_dae!(integrator, prob::ODEProblem,
     if isAD
         csize = count(algebraic_vars)
         if !(p isa SciMLBase.NullParameters) && typeof(_u) !== typeof(u)
-            try
+            if SciMLSturctures.isscimlstructure(p)
                 csize = max(csize, length(canonicalize(Tunable(), p)[1]))
-            catch
+            else
+                csize = max(csize, length(p))
             end
         end
         chunk = ForwardDiff.pickchunksize(csize)