From ecb233012d0569f0ea4982ec343c64992397352c Mon Sep 17 00:00:00 2001
From: Bram de Leeuw <bram-de-leeuw@hotmail.com>
Date: Thu, 5 Aug 2021 12:10:06 +0200
Subject: [PATCH] Fix error when executing method SSViewer::templates() when
 $subTemplates is still null

Without the fix this causes the framework to throw a 500 error:
`ERROR [Warning]: array_merge(): Expected parameter 2 to be an array, null given`

I noticed the error while doing a search with the `GridFieldAddExistingAutocompleter`. The error probably gets supressed on live environments.
---
 src/View/SSViewer.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/View/SSViewer.php b/src/View/SSViewer.php
index b05f5439d..b7397f30c 100644
--- a/src/View/SSViewer.php
+++ b/src/View/SSViewer.php
@@ -167,7 +167,7 @@ class SSViewer implements Flushable
      *
      * @var array
      */
-    protected $subTemplates = null;
+    protected $subTemplates = [];
 
     /**
      * @var bool