Don't require the start date for a nutritional plan

If not set, we use the current date as default

Author: rolandgeider

wger/nutrition/models/plan.py

@@ -31,7 +31,6 @@
 from wger.utils.cache import cache_mapper
 from wger.weight.models import WeightEntry
 
-
 logger = logging.getLogger(__name__)
 
 
@@ -61,6 +60,7 @@ class Meta:
 
     start = models.DateField(
         _('Start date'),
+        blank=True,
         default=datetime.date.today,
     )