railt/exception

Thank you for contributing Railt!
=========================================

Thank you for considering contributing to the Railt Framework! 
The contribution guide can be found in the [documentation](https://ru.railt.org/docs/extra/contributions).

English and Russian languages are available.
English is better but Russian is also OK.

## If you creating issue...

Please write following issue template. 
Do not forget describing how to reproduce.

## If you creating pull request...

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