remove some code to have better code coverage

src/onnx/onnx.cpp

@@ -460,18 +460,10 @@ struct onnx_parser
     {
         op::reshape op;
         if(args.size() == 1)
-        {
-            if(contains(attributes, "shape"))
         {
             literal s = parse_value(attributes.at("shape"));
             s.visit([&](auto v) { copy(v, std::back_inserter(op.dims)); });
         }
-            else
-            {
-                MIGRAPHX_THROW(
-                    "Parse_reshape: shape attribute is needed when only one argument is provided!");
-            }
-        }
         if(args.size() == 2)
         {
             auto s = args[1]->eval();