Defpartial for zero arity

[florius0]

Summary

This PR fixes a compilation error, when defcurry or defpartial are declared as zero-arity functions without parentheses: defcurry f, do: 1 and defpartial f, do: 1 respectively.

Test plan (required)

Corresponding tests are implemented and passing

Closing issues

Fixes #45

After Merge

• [ ] Does this change invalidate any docs or tutorials? If so ensure the changes needed are either made or recorded
• [x] Does this change require a release to be made? Is so please create and deploy the release