Bug Report

Is the issue related to model conversion?

Describe the bug

Since all([]) is always True passing empty list to make_attribute will be always list of ints

System information

Reproduction instructions

onnx.helper.make_attribute("attr_name", [])  # Always .type == INTS which isn't always expected

Expected behavior

For empty list make_attribute method should fail due to type inference error or there should be an explicit typed make_attribute method

Notes