title: Remove data from array if column is empty on string
body: <p>I need to remove a line from string if some column is empty:
  Check it:</p>
  
  <pre><code>ArrayList&lt;String&gt; students = new ArrayList&lt;&gt;();
          students.add("8246, ,JUCIELLY,SOUSA,ENSINO REGULAR - MEDIO - 1ช SERIE,JUCIELLY.SOUSA@aluno.ma.gov.br,10071999");
          students.add("8246,1282,JUCIELLY,SOUSA,ENSINO REGULAR - MEDIO - 1ช SERIE,JUCIELLY.SOUSA@aluno.ma.gov.br,10071999");
          students.add("8246,1282,JUCIELLY,SOUSA,ENSINO REGULAR - MEDIO - 1ช SERIE,JUCIELLY.SOUSA@aluno.ma.gov.br,10071999");
          students.add("8246,,JUCIELLY,SOUSA,ENSINO REGULAR - MEDIO - 1ช SERIE,JUCIELLY.SOUSA@aluno.ma.gov.br,10071999");
          students.add("8246,1282,,JUCIELLY.SOUSA@aluno.ma.gov.br,10071999");
          students.add("8246,1282, ,,10071999");
  </code></pre>
  
  <p>As you can see some colunms on this strins is EMPTY or " "(have blankspaces)</p>
  
  <p>someone can help me? i think it is easy to do but i tried and failed.</p>
  
  <p>i need a full 7 columns with something. cannot be ,, or blankspaces =\</p>