I'm developing a site around the starter kit. What would cause the teacommerce:GetPaymentForm function in the cart_step04.xslt file to return no value in the submit button?

      <div id="cartBottom" class="noPrint">
        <xsl:if test="$prevStep != ''">
          <a href="{umbraco.library:NiceUrl($prevStep/@id)}" id="prev">
            <xsl:value-of select="$prevStep/@nodeName" disable-output-escaping="yes" />
          </a>
        </xsl:if>
        <xsl:if test="$nextStep != ''">
          <div id="nextWrap">
            <div>
              <xsl:value-of select="$nextStep/@nodeName" disable-output-escaping="yes" />
            </div>
            <xsl:variable name="button">
              <xsl:text>&lt;input id=&quot;next&quot; type=&quot;submit&quot; value=&quot;&quot; class=&quot;&quot; /&gt;</xsl:text>
              <!--<xsl:text>&lt;input type=&quot;submit&quot; value=&quot;</xsl:text>
              <xsl:value-of select="umbraco.library:GetDictionaryItem('AcceptAndPay')" />
              <xsl:text>&quot; class=&quot;&quot; /&gt;</xsl:text>-->
            </xsl:variable>
            <xsl:value-of select="teacommerce:GetPaymentForm($button)" disable-output-escaping="yes" />
            <!--<input type="submit" value="{$nextStep/umbHeadline}" id="next" link="{umbraco.library:NiceUrl($nextStep/@id)}" />-->
          </div>
        </xsl:if>
      </div>

Output:

<input id="next" type="submit" value="" class="">