0.0.44 doesn't fails `bazel mod deps`

[jjudd]

This commit seems to have broken things for us: 12fd477

When I run bazel mod deps with that commit I get the following error:

bazel mod deps
ERROR: /home/redacted/.cache/bazel/_bazel_redacted/b380b3446fcd8bc5dde6a5e5af5d8825/external/rules_rs+/rs/extensions.bzl:496:33: Traceback (most recent call last):
        File "/home/redacted/.cache/bazel/_bazel_redacted/b380b3446fcd8bc5dde6a5e5af5d8825/external/rules_rs+/rs/extensions.bzl", line 1211, column 46, in _crate_impl
                facts |= _generate_hub_and_spokes(mctx, cfg.name, annotations, suggested_annotation_snippet_paths, cargo_path, cfg.cargo_lock, cargo_toml_by_hub_name[cfg.name], hub_packages, sparse_registry_configs, cfg.platform_triples, cargo_credentials, cfg.cargo_config, cfg.validate_lockfile, cfg.debug, cfg.use_experimental_platforms)
        File "/home/redacted/.cache/bazel/_bazel_redacted/b380b3446fcd8bc5dde6a5e5af5d8825/external/rules_rs+/rs/extensions.bzl", line 496, column 33, in _generate_hub_and_spokes
                possible_features = fact["features"]
Error: type 'NoneType' has no operator [](string)
ERROR: error evaluating module extension @@rules_rs+//rs:extensions.bzl%crate
<root> (lucid@_)

ERROR: Results may be incomplete as 1 extension failed.
    Fetching ...ension @@rules_rs+//rs:extensions.bzl%crate; Computing dependencies and features

When I use the previous commit things works for us: b418962

bazel mod deps
<root> (lucid@_)

I haven't had a chance to dig into this one, but I figured you may want to know.

[dzbarsky]

@jjudd is this still reproing for you on a recent release? Also do you happen to have a custom registry such as artifactory?