Add error handling case

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 95.12%. Comparing base (7994378) to head (ac46377).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #158 +/- ## ========================================== - Coverage 96.72% 95.12% -1.60% ========================================== Files 100 15 -85 Lines 2413 308 -2105 ========================================== - Hits 2334 293 -2041 + Misses 79 15 -64 ``` | [Flag](https://app.codecov.io/gh/diogomatoschaves/MyCryptoBot/pull/158/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Diogo+Matos+Chaves) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/diogomatoschaves/MyCryptoBot/pull/158/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Diogo+Matos+Chaves) | `95.12% <100.00%> (-1.60%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Diogo+Matos+Chaves#carryforward-flags-in-the-pull-request-comment) to find out more.

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