Use school term for filter only if existing

aleksis/apps/alsijil/filters.py

@@ -9,15 +9,18 @@ from .models import PersonalNote
 
 
 class PersonalNoteFilter(FilterSet):
-    day_start = DateFilter(
-        lookup_expr="gte", label=_("After"), initial=SchoolTerm.current.date_start
-    )
+    day_start = DateFilter(lookup_expr="gte", label=_("After"))
     day_end = DateFilter(lookup_expr="lte", label=_("Before"))
     subject = CharFilter(lookup_expr="icontains", label=_("Subject"))
 
     def __init__(self, data=None, *args, **kwargs):
         if data is not None:
             data = data.copy()
+
+            current_school_term = SchoolTerm.current
+            if not data.get("day_start") and current_school_term:
+                data["day_start"] = current_school_term.date_start
+
             for name, f in self.base_filters.items():
                 initial = f.extra.get("initial")
                 if not data.get(name) and initial: