[infra-tests] Accept partial dictionary definition in idlharness.js (#5717)

Quick fix for #5714.

I am not sure if this alone correctly fix the handling of partial dictionary. At least it stops idlharness from raising error.

View on GitHub: https://github.com/w3c/web-platform-tests/pull/5717

Received on Thursday, 27 April 2017 10:04:01 UTC