prefix age ranges with a letter, to make them usable as anchors

themis/datatypes/deputy.py

@@ -81,6 +81,8 @@ class Deputy(Item):
 
     @property
     def agerange(self):
+        if not self.birthdate:
+            return '?'
         today = datetime.datetime.today()
         age = (today.year - self.birthdate.year)
         if today.month < self.birthdate.month or \
@@ -88,14 +90,14 @@ class Deputy(Item):
                  today.day < self.birthdate.day):
             age -= 1
         if age < 30:
-            return '-30'
+            return 'm30'
         elif age < 40:
-            return '30-40'
+            return 'd30-40'
         elif age < 50:
-            return '40-50'
+            return 'd40-50'
         elif age < 60:
-            return '50-60'
+            return 'd50-60'
         elif age < 70:
-            return '60-70'
+            return 'd60-70'
         else:
-            return '+70'
+            return 'p70'