[0.11.0](https://github.com/pollination/pollination-dsl/compare/v0.10.3...v0.11.0) (2021-02-26)
Bug Fixes
* accept empty string as a default value ([9332976](https://github.com/pollination/pollination-dsl/commit/9332976bcbf5705217d98e24259aba4c68f33afb))
* **pull package:** catch the case for infinite pip install loop ([be224fe](https://github.com/pollination/pollination-dsl/commit/be224fe40656c5389eaf47d71701c252ef084f67))
Features
* **io:** add support for optional inputs and outputs ([fd93e8b](https://github.com/pollination/pollination-dsl/commit/fd93e8b8f075a5f02e1ad9f20b62ed95f9c28eb9))