title: java.lang.IllegalStateException: Migration didn't properly handle table
body: <p>How do you migrate an empty field type to text in Room ?</p>
  <p>Right now I'm facing this issue :</p>
  <blockquote>
  <p>java.lang.IllegalStateException: Migration didn't properly handle data_table</p>
  <p>Expected: TableInfo{name='data_table', columns=
  url=Column{name='url', <strong>type='TEXT'</strong>, notNull=false,
  primaryKeyPosition=0}.....</p>
  <p>Found: TableInfo{name='data_table', columns= url=Column{name='url',
  <strong>type=''</strong>, notNull=false, primaryKeyPosition=0}.....</p>
  </blockquote>
  <p>I've tried using the UNDEFINED typeAffinity, but that has no effect.</p>