fix #655

lib/bitcoin.py

@@ -84,7 +84,7 @@ def is_old_seed(seed):
 
     try:
         seed.decode('hex')
-        is_hex = True
+        is_hex = (len(seed) == 32)
     except Exception:
         is_hex = False
          

lib/wallet.py

@@ -1751,6 +1751,7 @@ class OldWallet(NewWallet):
     def create_watching_only_wallet(self, mpk):
         self.seed_version = OLD_SEED_VERSION
         self.storage.put('seed_version', self.seed_version, True)
+        self.storage.put('master_public_key', mpk, True)
         self.create_account(mpk)
 
     def get_seed(self, password):