bindings: If handler doesn't exist, set immediately

Fixes #9443

share/functions/fish_default_key_bindings.fish

@@ -14,7 +14,10 @@ function fish_default_key_bindings -d "emacs-like key binds"
             # This triggers the handler, which calls us again and ensures the user_key_bindings
             # are executed.
             set fish_key_bindings fish_default_key_bindings
-            return
+            # unless the handler somehow doesn't exist, which would leave us without bindings.
+            # this happens in no-config mode.
+            functions -q __fish_reload_key_bindings
+            and return
         end
     end