Merge pull request #6536 from tigercl/fix/authn-ssl

fix(authn): attempt to convert certificate content only when TLS is enabled

apps/emqx_authn/src/emqx_authn_api.erl

@@ -872,7 +872,7 @@ fill_defaults(Configs) when is_list(Configs) ->
 fill_defaults(Config) ->
     emqx_authn:check_config(Config, #{only_fill_defaults => true}).
 
-convert_certs(#{ssl := SSLOpts} = Config) ->
+convert_certs(#{ssl := #{enable := true} = SSLOpts} = Config) ->
     NSSLOpts = lists:foldl(fun(K, Acc) ->
                                case maps:get(K, Acc, undefined) of
                                    undefined -> Acc;