BUGFIX: project.start should be required because we need it to

calculate year of project

input/models.py

@@ -62,7 +62,7 @@ class Account(models.Model):
 class Project(Volunteer):
     name = models.CharField(max_length=200, verbose_name='Name des Projekts')
     description = models.CharField(max_length=500, verbose_name="Kurzbeschreibung", null=True)
-    start = models.DateField('Startdatum', null=True, blank= True)
+    start = models.DateField('Startdatum', null=True)
     end = models.DateField('Erwartetes Projektende', null=True)
     otrs = models.URLField(max_length=300, null=True, verbose_name='OTRS-Link')
     plan = models.URLField(max_length=2000, null=True, blank=True, verbose_name="Link zum Förderplan")