fix 'buttons' check to prevent errors

it could cause problems while generating, when 'buttons' is not present or in wrong format

templates/home.php

@@ -27,8 +27,10 @@
             foreach ($page['entry_page'] as $key => $node) {
                 echo '<a href="' . $node . '" class="Button Button--primary Button--hero">' . $key . '</a>';
             }
-            foreach ($params['html']['buttons'] as $name => $link ) {
-                echo '<a href="' . $link . '" class="Button Button--secondary Button--hero">' . $name . '</a>';
+            if(isset($params['html']['buttons']) && is_array($params['html']['buttons'])) {
+                foreach ($params['html']['buttons'] as $name => $link ) {
+                    echo '<a href="' . $link . '" class="Button Button--secondary Button--hero">' . $name . '</a>';
+                }
             }
             ?>
             <div class="clearfix"></div>