title: AttributeError: 'float' object has no attribute 'split'
body: <p>I am calling this line:</p>
  
  <pre><code>lang_modifiers = [keyw.strip() for keyw in row["language_modifiers"].split("|") if not isinstance(row["language_modifiers"], float)]
  </code></pre>
  
  <p>This seems to work where <code>row["language_modifiers"]</code> is a word (<code>atlas method</code>, <code>central</code>), but not when it comes up as <code>nan</code>.</p>
  
  <p>I thought my <code>if not isinstance(row["language_modifiers"], float)</code> could catch the time when things come up as <code>nan</code> but not the case. </p>
  
  <p>Background: <code>row["language_modifiers"]</code> is a cell in a tsv file, and comes up as <code>nan</code> when that cell was empty in the tsv being parsed.</p>