Use parent locale to resolve rbnf_locale_name if required

CHANGELOG.md

@@ -2,12 +2,16 @@
 
 ## Cldr v2.29.0
 
-This is the changelog for Cldr v2.29.0 released on ______, 2022.  For older changelogs please consult the release tag on [GitHub](https://github.com/elixir-cldr/cldr/tags)
+This is the changelog for Cldr v2.29.0 released on May 10th, 2022.  For older changelogs please consult the release tag on [GitHub](https://github.com/elixir-cldr/cldr/tags)
 
 ### Migration
 
 * The plugs `Cldr.Plug.SetLocale`, `Cldr.Plug.AcceptLanguage` and `Cldr.Plug.PutSession` have been extracted to their own library, [ex_cldr_plug](https://hex.pm/packages/ex_cldr_plug). Therefore adding `{:ex_cldr_plug, "~> 1.0"}` to the `deps` of any application using these plugs is required.
 
+### Bug Fixes
+
+* Fixes resolving the RBNF locale name for locales that inherit the RBNF locale from a parent. This is true for at least the "nb" locale which in previous releases had its own RBNF locale data but now inherits from "no". Thanks to @juanperi for the report. Closes [#175](https://github.com/elixir-cldr/cldr/issues/175).
+
 ## Cldr v2.28.0
 
 This is the changelog for Cldr v2.28.0 released on April 6th, 2022.  For older changelogs please consult the release tag on [GitHub](https://github.com/elixir-cldr/cldr/tags)

lib/cldr/locale.ex

@@ -420,7 +420,7 @@ defmodule Cldr.Locale do
     Enum.find(backend.known_locale_names(), &(locale_name == &1))
   end
 
-  def known_rbnf_locale_name(locale_name, _tags \\ [], backend) do
+  defp known_rbnf_locale_name(locale_name, _tags, backend) do
     locale_name = String.to_existing_atom(locale_name)
     Cldr.known_rbnf_locale_name(locale_name, backend)
   rescue ArgumentError ->
@@ -1591,8 +1591,23 @@ defmodule Cldr.Locale do
     @root_rbnf_locale_name
   end
 
+  # Get the rbnf locale name for this locale. If not found, see
+  # if a parent has RBNF> Note parent in this case means direct parent,
+  # not the fallback chain.
   defp rbnf_locale_name(%LanguageTag{} = language_tag) do
-    first_match(language_tag, &known_rbnf_locale_name(&1, &2, language_tag.backend))
+    cond do
+      rbnf_locale = first_match(language_tag, &known_rbnf_locale_name(&1, &2, language_tag.backend)) ->
+        rbnf_locale
+
+      parent = Map.get(parent_locale_map(), language_tag.cldr_locale_name) ->
+        case Cldr.validate_locale(parent, language_tag.backend) do
+          {:ok, parent} -> rbnf_locale_name(parent)
+          {:error, _} -> nil
+        end
+
+      true ->
+         nil
+    end
   end
 
   @spec gettext_locale_name(Cldr.LanguageTag.t()) :: locale_name | nil