pan>
<span class="source-line-no">067</span><span id="line-67">            }</span>
<span class="source-line-no">068</span><span id="line-68">            String arg = c.getFirstArg();</span>
<span class="source-line-no">069</span><span id="line-69">            if (c.isOptional() &amp;&amp; (arg == null || arg.isEmpty())) {</span>
<span class="source-line-no">070</span><span id="line-70">                return null;</span>
<span class="source-line-no">071</span><span id="line-71">            }</span>
<span c