tsvetkov-ii

Trafaret checks schema for operator and sensors in do template. It limits templating. This PR adds support for invalid schema at templating, but after transform it ensures schema.

add support for not checking callabacks before executing

1

Airflow declarative supports check callback for importable. If i have different environments for airflow workers i can't build my dags. I want the solution which can work with checking importable...

yaml.dump at the end of stream always add '\n...\n' it can't be disabled and it cause errors when templating something in strings. This PR fixes this behavior.