Better way of getting keys

I used keyword_list[:key], but if the key doesn't exist, it will return nil. I actually expect a list and further down the code I use that list.
I believe the key should always be present, but in case it's not, it's better to return an empty list instead of nil. That way the code wont fail further down the line.

lib/pleroma/config/deprecation_warnings.ex

@@ -21,7 +21,7 @@ defmodule Pleroma.Config.DeprecationWarnings do
   ]
 
   def check_exiftool_filter do
-    filters = Config.get([Pleroma.Upload])[:filters]
+    filters = Config.get([Pleroma.Upload]) |> Keyword.get(:filters, [])
 
     if Pleroma.Upload.Filter.Exiftool in filters do
       Logger.warn("""

test/pleroma/config/deprecation_warnings_test.exs

@@ -51,7 +51,7 @@ defmodule Pleroma.Config.DeprecationWarningsTest do
 
       capture_log(fn -> DeprecationWarnings.warn() end)
 
-      assert Config.get([Pleroma.Upload])[:filters] == expected_config
+      assert Config.get([Pleroma.Upload]) |> Keyword.get(:filters, []) == expected_config
     end
 
     test "doesn't give a warning with correct config" do