ERR: catchall exception should be explicity and use Exception EAFP
EAFP is an acronym that stands for "easier to ask forgiveness than permission" and describes a principle behind the pythonic way of doing some operations that may fail:

``` python

try:
    do_smth()
except MyError:
    do_smth_otherwise()
```

as opposed to

``` python
if i_can_do_smth():
    do_smth()
else:
    do_smth_otherwise()
```

pandas sources use this a lot but often the exception is caught with `except:` which among other things intercept `SystemExit` and `KeyboardInterrupt`.  Because of that it's possible that when you're trying to interrupt an operation it goes on simply choosing another code path.

There are valid use cases for carpet-catching excepts like that, most obvious ones being performing some cleanup and re-raising the error afterwards and catching all errors coming from evaluation of user-supplied code. In the rest of the cases `except Exception:` should be used instead.
