fix config saving bug

config.yaml

@@ -4,8 +4,8 @@ config:
   create: true
   dotpath: dotfiles
   keepdot: false
-  longkey: false
-  link_on_import: nolink
   link_dotfile_default: nolink
+  link_on_import: nolink
+  longkey: false
 dotfiles:
 profiles:

dotdrop/cfg_yaml.py

@@ -717,10 +717,10 @@ class CfgYaml:
             newv = v
             if isinstance(v, dict):
                 newv = self._clear_none(v)
+                if not newv:
+                    continue
             if newv is None:
                 continue
-            if not newv:
-                continue
             new[k] = newv
         return new