Fatal1ty / mashumaro / 120

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Pull #18

travis-ci

Fix case: class without annotations

A dataclass can exists which satisfied the following:
- does not specify any annotations.
- e.g. leaf class for class typing (with pass)
- or only specifying class attributes (but without annotating, somewhat unclean, yeah)

In this case python (3.7.5) does not populate __annotations__

This fix falls back to an empty array to satisfy the runtime assumption
about the type of self.annotations property

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