Only If Not Empty Liquid

gistfile1.liquid

    <cml:radios name="category" label="Choose the best category for this product:" validates="required"> 
      <cml:radio label="{{pt_1}}" value="{{pt_1}}" /> 
      {% if pt_2 != '' and pt_2 != 'No data available' and pt_2 != empty %}
      <cml:radio label="{{pt_2}}" value="{{pt_2}}" /> 
{% endif %}
      {% if pt_3 != '' and pt_3 != 'No data available' and pt_3 != empty %}
      <cml:radio label="{{pt_3}}" value="{{pt_3}}" /> 
{% endif %}
      {% if pt_4 != '' and pt_4 != 'No data available' and pt_4 != empty %}
      <cml:radio label="{{pt_4}}" value="{{pt_4}}" /> 
{% endif %}
      {% if pt_5 != '' and pt_5 != 'No data available' and pt_5 != empty %}
      <cml:radio label="{{pt_5}}" value="{{pt_5}}" /> 
{% endif %}
      {% if pt_6 != '' and pt_6 != 'No data available' and pt_6 != empty %}
      <cml:radio label="{{pt_6}}" value="{{pt_6}}" /> 
{% endif %}
      {% if pt_7 != '' and pt_7 != 'No data available' and pt_7 != empty %}
      <cml:radio label="{{pt_7}}" value="{{pt_7}}" /> 
{% endif %}
      {% if pt_8 != '' and pt_8 != 'No data available' and pt_8 != empty %}
      <cml:radio label="{{pt_8}}" value="{{pt_8}}" /> 
{% endif %}
      {% if pt_0 != '' and pt_0 != 'No data available' and pt_0 != empty %}
      <cml:radio label="{{pt_0}}" value="{{pt_0}}" /> 
{% endif %}
    </cml:radios>