better "addrmeta is None" fix

src/dexorder/addrmeta.py

@@ -19,7 +19,9 @@ class AddressMetadata (TypedDict):
 
 
 def save_addrmeta(address: str, meta: AddressMetadata):
-    if meta['type'] == 'Token':
+    if meta is None:
+        pass
+    elif meta['type'] == 'Token':
         meta: OldTokenDict
         updated = Token.load(meta)
         token = db.session.get(Token, (current_chain.get().id, address))