fixup! tests: Improve test_throws_unwrap error comparisons

Author: jpsamaroo

Diff for: test/util.jl

@@ -36,7 +36,7 @@ function _test_throws_unwrap(terr, ex; to_match=[])
     end
     quote
         $oerr, $rerr = try
-            $(esc(ex))
+            nothing, $(esc(ex))
         catch err
             (err, Dagger.Sch.unwrap_nested_exception(err))
         end