Fix z-song#4426

Author: z-song

src/Form/Field/Tags.php

@@ -168,6 +168,10 @@ public function value($value = null)
      */
     public function render()
     {
+        if (!$this->shouldRender()) {
+            return '';
+        }
+
         $this->setupScript();
 
         if ($this->keyAsValue) {

src/Form/Field/Textarea.php

@@ -32,6 +32,10 @@ public function rows($rows = 5)
      */
     public function render()
     {
+        if (!$this->shouldRender()) {
+            return '';
+        }
+
         if (is_array($this->value)) {
             $this->value = json_encode($this->value, JSON_PRETTY_PRINT);
         }