title: Rotate x-axis labels FacetGrid seaborn not working
body: <p>I'm attempting to create a faceted plot using seaborn in python, but I'm having issues with a number of things, one thing being rotating the x-axis labels.</p>
  
  <p>I am currently attempting to use the following code:</p>
  
  <pre><code>import pandas as pd
  import seaborn as sns
  import matplotlib.pyplot as plt 
  
  vin = pd.Series(["W1","W1","W2","W2","W1","W3","W4"])
  word1 = pd.Series(['pdi','pdi','tread','adjust','fill','pdi','fill'])
  word2 = pd.Series(['perform','perform','fill','measure','tire','check','tire'])
  date = pd.Series(["01-07-2020","01-07-2020","01-07-2020","01-07-2020","01-08-2020","01-08-2020","01-08-2020"])
  
  bigram_with_dates = pd.concat([vin,word1,word2,date], axis = 1)
  names = ["vin", "word1","word2","date"]
  bigram_with_dates.columns = names
  bigram_with_dates['date'] = pd.to_datetime(bigram_with_dates['date'])
  bigram_with_dates['text_concat'] = bigram_with_dates['word1'] + "," + bigram_with_dates['word2']
  
  plot_params = sns.FacetGrid(bigram_with_dates, col="date", height=3, aspect=.5, col_wrap = 10,sharex = False, sharey = False)
  plot = plot_params.map(sns.countplot, 'text_concat', color = 'c', order = bigram_with_dates['text_concat'])
  plot_adjust = plot.fig.subplots_adjust(wspace=0.5, hspace=0.5)
  
  for axes in plot.axes.flat:
      axes.set_xticklabels(axes.get_xticklabels(), rotation=90)
  
  </code></pre>
  
  <p>When I use this I get an error that states:</p>
  
  <pre><code>AttributeError: 'NoneType' object has no attribute 'axes'
  </code></pre>
  
  <p>Which I think I understand to mean that there is no returned object so setting axes on nothing does nothing. </p>
  
  <p>This code seems to work in other SO posts I've come across, but I can't seem to get it to work. </p>
  
  <p>Any suggestions as to what I'm doing wrong would be greatly appreciated.</p>
  
  <p>Thanks,
  Curtis</p>