Styling code not executed
#### Code Sample, a copy-pastable example if possible

```python
# Your code here

# the code is from the example of styling with a little modification(add a rasie in function highlight_max, to see if the function is called or not(the result is NOT)
# https://pandas.pydata.org/pandas-docs/stable/style.html

import pandas as pd
import numpy as np

np.random.seed(24)
df = pd.DataFrame({'A': np.linspace(1, 10, 10)})
df = pd.concat([df, pd.DataFrame(np.random.randn(10, 4), columns=list('BCDE'))],
               axis=1)
df.iloc[0, 2] = np.nan
def highlight_max(s):
    raise  ##### try to RAISE a exception here
    '''
    highlight the maximum in a Series yellow.
    '''
    is_max = s == s.max()
    return ['background-color: yellow' if v else '' for v in is_max]
df.style.apply(highlight_max)
display(df)
display(pd.__version__)

```
#### Problem description
The minimal example showd the styling callback function is not called(no raise happened)

#### Expected Output
raise an exception in styling function, but actually NOT(not executed the function)
#### Output of ``pd.show_versions()``
0.21.0



</details>
