Merge branch 'hruska-bugfix-#7589-timeline-search-crash' into devel

lib/hawat/blueprints/timeline/__init__.py

@@ -132,6 +132,8 @@ class AbstractSearchView(PsycopgMixin, CustomSearchView):  # pylint: disable=loc
         if dt_from:
             dt_from = dt_from.astimezone(pytz.utc)
             dt_from = dt_from.replace(tzinfo=None)
+        else:
+            dt_from = hawat.forms.default_dt_with_delta()
         dt_to = form_data.get('dt_to', None)
         if dt_to:
             dt_to = dt_to.astimezone(pytz.utc)