thumbor / thumbor / 5324675497 / 5

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Refactor code blocks for increased readability

Cues from pylint. Issues solved are as follows:

```
************* Module thumbor.config
thumbor/config.py:914:12: R1713: Consider using str.join(sequence) for concatenating strings from an iterable (consider-using-join)
************* Module thumbor.utils
thumbor/utils.py:92:4: R1705: Unnecessary "else" after "return", remove the "else" and de-indent the code inside it (no-else-return)
************* Module tests.fixtures.transformer_test_data
tests/fixtures/transformer_test_data.py:79:8: W0719: Raising too general exception: Exception (broad-exception-raised)
```

This CL also fixes a code duplication issue in thumbor/utils.py

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