Fix more PHP 8 issues

Author: iherwig

src/wcmf/application/views/plugins/modifier.filter.php

@@ -26,9 +26,9 @@
  * @return Array
  */
 function smarty_modifier_filter($objects, $attribute, $regex, $invert=false) {
-  return array_filter($objects, function($obj) use ($attribute, $regex, $invert) {
+  return is_array($objects) ? array_filter($objects, function($obj) use ($attribute, $regex, $invert) {
     $match = preg_match($regex, $obj->getValue($attribute));
     return $invert ? !$match : $match;
-  });
+  }) : [];
 }
 ?>

src/wcmf/lib/presentation/link/LinkProcessor.php

@@ -54,10 +54,13 @@ public static function processLinks($node, $base, LinkProcessorStrategy $strateg
       $oldValue = $value;
 
       // find links in texts
-      $urls = array_fill_keys(StringUtil::getUrls($value), 'embedded');
-      // find direct attribute urls
-      if (preg_match('/^[a-zA-Z]+:\/\//', $value) || InternalLink::isLink($value)) {
-        $urls[$value] = 'direct';
+      $urls = [];
+      if (is_string($value)) {
+        $urls = array_fill_keys(StringUtil::getUrls($value), 'embedded');
+        // find direct attribute urls
+        if (preg_match('/^[a-zA-Z]+:\/\//', $value) || InternalLink::isLink($value)) {
+          $urls[$value] = 'direct';
+        }
       }
 
       // process urls