Description should not be mandatory, see #400

app/Model/TaskValidator.php

@@ -70,7 +70,6 @@ class TaskValidator extends Base
     {
         $rules = array(
             new Validators\Required('id', t('The id is required')),
-            new Validators\Required('description', t('The description is required')),
         );
 
         $v = new Validator($values, array_merge($rules, $this->commonValidationRules()));

app/Template/task_edit_description.php

@@ -7,7 +7,7 @@
     <?= Helper\form_csrf() ?>
 
     <?= Helper\form_hidden('id', $values) ?>
-    <?= Helper\form_textarea('description', $values, $errors, array('autofocus', 'required', 'placeholder="'.t('Leave a description').'"'), 'description-textarea') ?><br/>
+    <?= Helper\form_textarea('description', $values, $errors, array('autofocus', 'placeholder="'.t('Leave a description').'"'), 'description-textarea') ?><br/>
     <div class="form-help"><a href="http://kanboard.net/documentation/syntax-guide" target="_blank" rel="noreferrer"><?= t('Write your text in Markdown') ?></a></div>
 
     <div class="form-actions">