refactor(types): drop guards and clauses that can never succeed

lib/mv/membership/member/validations/email_change_permission.ex

@@ -59,7 +59,7 @@ defmodule Mv.Membership.Member.Validations.EmailChangePermission do
 
   # Ash stores actor in changeset.context.private.actor; validation context has .actor; some callsites use context.actor
   defp resolve_actor(changeset, context) do
-    ctx = changeset.context || %{}
+    ctx = changeset.context
 
     get_in(ctx, [:private, :actor]) ||
       Map.get(ctx, :actor) ||

lib/mv/membership/member_export.ex

@@ -473,9 +473,6 @@ defmodule Mv.Membership.MemberExport do
          computed_fields,
          member_fields
        ) do
-    computed_fields = computed_fields || []
-    member_fields = member_fields || []
-
     db_with_insert =
       Enum.flat_map(db_fields_ordered, fn f ->
         expand_field_with_computed(f, member_fields, computed_fields)

lib/mv/oidc_role_sync_config.ex

@@ -15,6 +15,6 @@ defmodule Mv.OidcRoleSyncConfig do
 
   @doc "Returns the JWT/user_info claim name for groups; defaults to \"groups\"."
   def oidc_groups_claim do
-    Mv.Config.oidc_groups_claim() || "groups"
+    Mv.Config.oidc_groups_claim()
   end
 end