Provide empty `name` and `sha256`
Needed if no Python version is set and `conda-smithy` or another program
tries to parse the contents without a Python version.
+{% set name = "" %}
+{% set sha256 = "" %}
+
{% set name = "antlr4-python2-runtime" %} # [py2k]
{% set sha256 = "3bc09f7fe058fe8ede92e5d292f7a6932022cde28bb0ba5f44f96842c3c894d8" %} # [py2k]
