MultiSource should fail if no sources are given.

shawnbrown / datatest

Tools for test driven data-wrangling and data validation.

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MultiSource should fail if no sources are given. #21

Closed shawnbrown closed 7 years ago

shawnbrown commented 8 years ago

Calling MultiSource() without providing any sub-sources should raise an error. Allowing empty MultiSource objects can cause confusing error messages.

shawnbrown commented 7 years ago

This is done: a92289e4ca166fc1abc20628ad4af6c0f48589d7