Fix crash when doc could not be found or parsed

src/cutecoin/core/txhistory.py

@@ -89,7 +89,7 @@ class TxHistory():
         """
         Parse a transaction
         :param cutecoin.core.Community community: The community
-        :param dict tx: The tx json data
+        :param ucoinpy.documents.Transaction tx: The tx json data
         :param int block_number: The block number were we found the tx
         :param int mediantime: Median time on the network
         :param list received_list: The list of received transactions
@@ -184,8 +184,10 @@ class TxHistory():
         :return: The list of transfers sent
         """
         block = None
+        block_doc = None
         tries = 0
         while block is None and tries < 3:
+            try:
                 block = yield from community.bma_access.future_request(bma.blockchain.Block,
                                       req_args={'number': block_number})
                 signed_raw = "{0}{1}\n".format(block['raw'],
@@ -193,11 +195,15 @@ class TxHistory():
                 transfers = []
                 try:
                     block_doc = Block.from_signed_raw(signed_raw)
-            except:
+                except TypeError:
                     logging.debug("Error in {0}".format(block_number))
                     block = None
                     tries += 1
-
+            except ValueError as e:
+                if '404' in str(e):
+                    block = None
+                    tries += 1
+        if block_doc:
             for (txid, tx) in enumerate(block_doc.transactions):
                 transfer = yield from self._parse_transaction(community, tx, block_number,
                                         block_doc.mediantime, received_list,
@@ -207,6 +213,8 @@ class TxHistory():
                     transfers.append(transfer)
                 else:
                     logging.debug("None transfer")
+        else:
+            logging.debug("Could not find or parse block {0}".format(block_number))
         return transfers
 
     @asyncio.coroutine