Merge JoinMarket-Org/joinmarket-clientserver#1605: Fix `OrderbookWatch.on_order_seen()` exception debug messages

bfc618a99e Fix OrderbookWatch.on_order_seen() exception debug messages (Kristaps Kaupe)

Pull request description:

  You cannot concatenate `str` with `int`. Found while working on #1602.

ACKs for top commit:
  AdamISZ:
    utACK bfc618a99e

Tree-SHA512: 34e2181bd91c856348fee88233f76d25a51d1626d1ad3523e861caa3ba84c248371de874841038381839efa4816d58d2d0933628f79bcf7d64295483c7959dfc

src/jmdaemon/orderbookwatch.py

@@ -116,9 +116,9 @@ class OrderbookWatch(object):
                 (counterparty, oid, ordertype, minsize, maxsize, txfee,
                  str(Decimal(cjfee))))  # any parseable Decimal is a valid cjfee
         except InvalidOperation:
-            log.debug("Got invalid cjfee: " + cjfee + " from " + counterparty)
+            log.debug("Got invalid cjfee: " + str(cjfee) + " from " + counterparty)
         except Exception as e:
-            log.debug("Error parsing order " + oid + " from " + counterparty)
+            log.debug("Error parsing order " + str(oid) + " from " + counterparty)
             log.debug("Exception was: " + repr(e))
         finally:
             self.dblock.release()