Ignore missing rate for date before today

The test scenario is updated also to ensure that cron is run at least one
day that is not an bank holiday.

issue10511
review336421002

currency.py

@@ -381,7 +381,8 @@ class Cron(ModelSQL, ModelView):
                 yield from self._rates(date)
             except CronFetchError:
                 logger.warning("Could not fetch rates temporary")
-                break
+                if date >= datetime.date.today():
+                    break
             except Exception:
                 logger.error("Fail to fetch rates", exc_info=True)
                 break

tests/scenario_currency_rate_update.rst

@@ -9,8 +9,8 @@ Imports::
     >>> from trytond.tests.tools import activate_modules
 
     >>> today = dt.date.today()
-    >>> yesterday = today - dt.timedelta(days=1)
-    >>> before_yesterday = yesterday - dt.timedelta(days=1)
+    >>> previous_week = today - dt.timedelta(days=7)
+    >>> before_previous_week = previous_week - dt.timedelta(days=1)
 
 Activate modules::
 
@@ -36,19 +36,19 @@ Setup cron::
     >>> cron.day = None
     >>> cron.currency = eur
     >>> cron.currencies.append(Currency(usd.id))
-    >>> cron.last_update = before_yesterday
+    >>> cron.last_update = before_previous_week
     >>> cron.save()
 
 Run update::
 
     >>> cron.click('run')
-    >>> cron.last_update >= yesterday
+    >>> cron.last_update >= previous_week
     True
 
     >>> eur.reload()
-    >>> rate, = [r for r in eur.rates if r.date == yesterday]
+    >>> rate = [r for r in eur.rates if r.date < today][0]
     >>> rate.rate
     Decimal('1.000000')
-    >>> rate, = [r for r in usd.rates if r.date == yesterday]
+    >>> rate = [r for r in usd.rates if r.date < today][0]
     >>> bool(rate.rate)
     True