This fixes system/system not properly loading due to themes being null.

Signed-off-by: Álvaro Fernández Rojas <[email protected]>
---
diff --git a/luci2/htdocs/luci2/luci2.js b/luci2/htdocs/luci2/luci2.js
index 040f1e5..a92aaeb 100644
--- a/luci2/htdocs/luci2/luci2.js
+++ b/luci2/htdocs/luci2/luci2.js
@@ -5190,13 +5190,15 @@ function LuCI2()
                        {
                                delete validation.message;
 
-                               if ((val.length == 0 && !d.opt))
-                               {
-                                       rv = d.self.setError($elem, L.tr('Field 
must not be empty'));
-                               }
-                               else if (val.length > 0 && 
!vstack[0].apply(val, vstack[1]))
-                               {
-                                       rv = d.self.setError($elem, 
validation.message, vstack[1]);
+                               if (val) {
+                                       if ((val.length == 0 && !d.opt))
+                                       {
+                                               rv = d.self.setError($elem, 
L.tr('Field must not be empty'));
+                                       }
+                                       else if (val.length > 0 && 
!vstack[0].apply(val, vstack[1]))
+                                       {
+                                               rv = d.self.setError($elem, 
validation.message, vstack[1]);
+                                       }
                                }
                                else
                                {
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