title: Merge multiple dataframes without common columns
body: <p>I have 2 datasets.</p>
  
  <pre><code>dict1 =pd.DataFrame({'Name' : ['A','B','C','D'], 'Score' : [19,20,11,12]})
  list1 =pd.DataFrame(['Math', 'English', 'History', 'Science'])
  concat_data = pd.concat([dict1,list1])
  </code></pre>
  
  <p>output :</p>
  
  <pre><code>Name  Score        0
  0    A   19.0      NaN
  1    B   20.0      NaN
  2    C   11.0      NaN
  3    D   12.0      NaN
  0  NaN    NaN     Math
  1  NaN    NaN  English
  2  NaN    NaN  History
  3  NaN    NaN  Science
  </code></pre>
  
  <p>The output I am looking for:</p>
  
  <pre><code>Name  Score        0
  0    A   19.0      Math
  1    B   20.0      English
  2    C   11.0      History
  3    D   12.0      Science
  </code></pre>
  
  <p>Can anyone help me with this?</p>