[FIX] undefined last_exception in transaction.execute (#270)

cbergmiller · dhoomakethu · commit e91d5deaf4be · 2018-01-28T15:57:14.000+05:30
diff --git a/pymodbus/transaction.py b/pymodbus/transaction.py
@@ -121,6 +121,7 @@ def execute(self, request):
                     expected_response_length = self._calculate_response_length(
                         response_pdu_size)
 
+        last_exception = None
         while retries > 0:
             try:
                 self.client.connect()
