Added missing safe guard for hiding footer navigation

Author: squidfunk

material/partials/footer.html

@@ -3,7 +3,9 @@
 -#}
 <footer class="md-footer">
   {% if page.previous_page or page.next_page %}
-    {% set hidden = "hidden" if "footer" in page.meta.hide %}
+    {% if page.meta and page.meta.hide %}
+      {% set hidden = "hidden" if "footer" in page.meta.hide %}
+    {% endif %}
     <nav class="md-footer__inner md-grid" aria-label="{{ lang.t('footer.title') }}" {{ hidden }}>
       {% if page.previous_page %}
         {% set direction = lang.t("footer.previous") %}

src/partials/footer.html

@@ -25,7 +25,9 @@
 
   <!-- Link to previous and/or next page -->
   {% if page.previous_page or page.next_page %}
-    {% set hidden = "hidden" if "footer" in page.meta.hide %}
+    {% if page.meta and page.meta.hide %}
+      {% set hidden = "hidden" if "footer" in page.meta.hide %}
+    {% endif %}
     <nav
       class="md-footer__inner md-grid"
       aria-label="{{ lang.t('footer.title') }}"