minor fixes

gui/qt/main_window.py

@@ -685,7 +685,7 @@ class ElectrumWindow(QMainWindow):
             return
         addr = str(item.text(2))
         req = self.wallet.receive_requests[addr]
-        expires = _('Never') if req.get('exp') is None else util.age(req['time'] + req['exp'])
+        expires = util.age(req['time'] + req['exp']) if req.get('exp') else _('Never')
         amount = req['amount']
         message = self.wallet.labels.get(addr, '')
         self.receive_address_e.setText(addr)

lib/paymentrequest.py

@@ -291,7 +291,7 @@ def make_unsigned_request(req):
     from transaction import Transaction
     addr = req['address']
     time = req.get('time', 0)
-    expires = req.get('exp', 0)
+    exp = req.get('exp', 0)
     if time and type(time) != int:
         time = 0
     if exp and type(exp) != int:
@@ -306,7 +306,7 @@ def make_unsigned_request(req):
     for script, amount in outputs:
         pd.outputs.add(amount=amount, script=script)
     pd.time = time
-    pd.expires = time + expires if expires else 0
+    pd.expires = time + exp if exp else 0
     pd.memo = memo
     pr = pb2.PaymentRequest()
     pr.serialized_payment_details = pd.SerializeToString()