add NotEnoughFunds exception

lib/util.py

@@ -4,6 +4,7 @@ import shutil
 from datetime import datetime
 is_verbose = False
 
+class NotEnoughFunds(Exception): pass
 
 class MyEncoder(json.JSONEncoder):
     def default(self, obj):

lib/wallet.py

@@ -27,7 +27,7 @@ import math
 import json
 import copy
 
-from util import print_msg, print_error
+from util import print_msg, print_error, NotEnoughFunds
 
 from bitcoin import *
 from account import *
@@ -712,8 +712,9 @@ class Abstract_Wallet(object):
             fee = fixed_fee if fixed_fee is not None else self.estimated_fee(tx)
             if total >= amount + fee: break
         else:
-            print_error("Not enough funds", total, amount, fee)
-            return None
+            raise NotEnoughFunds()
+            #print_error("Not enough funds", total, amount, fee)
+            #return None
 
         # change address
         if not change_addr: