<input name="field_null[{{ column_number }}]" id="field_{{ column_number }}_{{ ci - ci_offset }}" {% if column_meta['Null'] is not empty and column_meta['Null'] != 'NO' and column_meta['Null'] != 'NOT NULL' -%} checked="checked" {%- endif %} type="checkbox" value="NULL" class="allow_null" />