fix coalesce warning

Helm complains when coasescing objects of two different types, such as from the default list to map

Signed-off-by: TheRealNoob <[email protected]>
Signed-off-by: TheRealNoob <[email protected]>

Author: TheRealNoob

charts/dex/values.yaml

@@ -344,7 +344,7 @@ networkPolicy:
 # -- extra objects to deploy
 # extraObjects can be of type map or slice.  If slice, keys are ignored and only values are used.
 # items contained within extraObjects can be defined as dict or string and are passed through tpl.
-extraObjects: []
+extraObjects: null
 # - apiVersion: v1
 #   kind: Secret
 #   type: Opaque