[Error-Handling]: instructions are unclear, and wrong programs pass the tests

I just did the error-handling exercise, and had several issues:

- It was unclear at first what to do with inputs. Looking at the tests, it seemed that trying to convert the input to `int` was the right thing to try, but this is not mentioned in the readme or the stubs.
- The test for whether a method throws an exception will pass any error that might occur, not just if it's intentionally raised:
```python
def handle_error_by_throwing_exception():
raise "(╯°□°）╯︵ ┻━┻" # Raising a string is a TypeError, but passes the test
```
- When returning a tuple, which element should be the result and which one the status? What should the result element be when it fails? No suggestion
- No mention of advantages or disadvantages of the different kinds of error handling, or what is idiomatic Python.