DOC: Validation script doesn't report that the docstring is correct
When executing for example:
```
./scripts/validate_docstrings.py pandas.DataFrame.head
```
The script, after the docstring, should report:
```
################################################################################
################################## Validation ##################################
################################################################################
Docstring for DataFrame.head correct. :)
```
But for some reason, the sentence `Docstring for DataFrame.head correct. :)` is not being printed.

This is the line that is not being executed: https://github.com/pandas-dev/pandas/blob/master/scripts/validate_docstrings.py#L364