fix {{chunk[+ph+]}}

Author: Dmi3yy

core/src/Core.php

@@ -1484,6 +1484,10 @@ public function mergeChunkContent($content, $ph = false)
             }
             $value = $ph[$key];
 
+            if ($value === null && !stripos('[',$key)) {
+                continue;
+            }
+
             $value = $this->parseText($value, $params); // parse local scope placeholers for ConditionalTags
             $value = $this->mergePlaceholderContent($value, $params);  // parse page global placeholers
             if ($this->getConfig('enable_at_syntax')) {