ga conversion support

conf/app.php

@@ -202,7 +202,7 @@ $configs = array(
 
     //Google Adwords conversion配置
     //示例：{'controller': 'xx', 'action': 'yy', 'send_to': 'zzz'}
-    'GA_MEASUREMENT_CONVERSIONS' => [],
+    'GA_MEASUREMENT_CONVERSIONS' => array(),
 
     //密码授权默认关闭
     "password_auth" => array(

plugins/Html.php

@@ -125,12 +125,12 @@ eof;
         }
 
 
-        if (!empty(FSC::$app['config']['GA_MEASUREMENT_CONVERSIONS'])) {
-            $conversions = FSC::$app['config']['GA_MEASUREMENT_CONVERSIONS'];
+        $conversions = !empty(FSC::$app['config']['GA_MEASUREMENT_CONVERSIONS']) ? FSC::$app['config']['GA_MEASUREMENT_CONVERSIONS'] : array();
+        if (!empty($conversions)) {
             //格式：{'controller': 'xx', 'action': 'yy', 'send_to': 'zzz'}
             foreach ($conversions as $item) {
                 if (FSC::$app['controller'] == $item['controller'] && FSC::$app['action'] == $item['action']) {
-                    gacode .= <<<eof
+                    $gacode .= <<<eof
 
   gtag('event', 'conversion', {'send_to': '{$item['send_to']}'});
 eof;