fix: render empty field for page field.

recently, changed logic to only render fields if value is present.
however, this caused an issue with page fields, as they are always empty and are updated by wkhtmltopdf.

print_designer/print_designer/page/print_designer/jinja/macros/spantag.html

@@ -24,7 +24,7 @@
 <!-- third Arg is row which is not sent outside table -->
 {% macro span_tag(field, element, row = {}, send_to_jinja = {}) -%}
     {% set span_value = spanvalue(field, element, row, send_to_jinja) %}
-    {%- if span_value -%}
+    {%- if span_value or field.fieldname in ['page', 'topage', 'time', 'date'] -%}
         <span class="{% if not field.is_static and field.is_labelled %}baseSpanTag{% endif %}">
             {% if not field.is_static and field.is_labelled%}
                 <span class="{% if row %}printTable{% else %}dynamicText{% endif %} label-text labelSpanTag" style="user-select:auto; {%if element.labelStyle %}{{convert_css(element.labelStyle)}}{%endif%}{%if field.labelStyle %}{{convert_css(field.labelStyle)}}{%endif%} white-space:nowrap; ">