Fixes #67

app/code/community/Webguys/Easytemplate/Block/Input/Renderer/Reference.php

@@ -2,7 +2,7 @@
 
 class Webguys_Easytemplate_Block_Input_Renderer_Reference extends Webguys_Easytemplate_Block_Input_Renderer_Abstract
 {
-    public function __construct(array $args = array())
+    public function __construct(array $args = [])
     {
         parent::__construct($args);
         $this->setTemplate('easytemplate/input/renderer/reference.phtml');
@@ -47,6 +47,15 @@ public function getReferenceLabel()
     public function getReferenceDefaultName()
     {
         $configModel = Mage::getSingleton('easytemplate/input_parser');
+        if (!$configModel->getTemplate($this->getReference())) {
+            Mage::getSingleton('core/session')->addError(
+                $this->__('Template with reference name "%s" not found.', $this->getReference())
+            );
+            $ex = new Webguys_Easytemplate_Exception_RedirectException();
+            $ex->prepareRedirect('adminhtml/cms_page');
+            throw $ex;
+
+        }
         return $configModel->getTemplate($this->getReference())->getLabel();
     }
-}
+}

app/code/community/Webguys/Easytemplate/Block/Template.php

@@ -33,8 +33,8 @@ public function getChildTemplates()
         return $this->getRenderer()->getChild();
     }
 
-    public function getChildHtml()
+    public function getChildHtml($name = '', $useCache = true, $sorted = false)
     {
         return $this->getRenderer()->toHtml();
     }
-}
+}

app/code/community/Webguys/Easytemplate/Exception/RedirectException.php

@@ -0,0 +1,11 @@
+<?php
+
+class Webguys_Easytemplate_Exception_RedirectException extends Mage_Core_Controller_Varien_Exception
+{
+    public function prepareRedirect($path, $arguments = [])
+    {
+        $this->_resultCallback       = self::RESULT_REDIRECT;
+        $this->_resultCallbackParams = [$path, $arguments];
+        return $this;
+    }
+}

app/code/community/Webguys/Easytemplate/Model/Input/Renderer/Validator/File.php

@@ -32,6 +32,10 @@ public function prepareForSave($data)
             }
         }
 
+        if (empty($data['value']) && empty($data['existing'])) {
+            return '';
+        }
+
         $fileName = !empty($data['value']) ? $data['value'] : $data['existing'];
         return Mage_Core_Model_File_Uploader::getNewFileName(strtolower($fileName));
     }
@@ -100,4 +104,4 @@ protected function uploadComplete()
     {
         return ($this->extractFilePostInformation('error') === UPLOAD_ERR_OK);
     }
-}
+}

app/code/community/Webguys/Easytemplate/Model/Template.php

@@ -132,6 +132,10 @@ public function _afterSave()
 
             foreach ($model->getFields() as $field) {
 
+                if (!isset($this->_field_data[$field->getCode()])) {
+                    continue;
+                }
+
                 $inputValidator = $field->getInputRendererValidator();
                 $inputValidator->setTemplate($this);
                 $inputValidator->setField($field);
@@ -209,6 +213,6 @@ public function getFieldData($field = null)
         if ($field === null) {
             return $this->_field_data;
         }
-        return $this->_field_data[$field];
+        return isset($this->_field_data[$field]) ? $this->_field_data[$field] : null;
     }
-}
+}