Quality of Life improvements

* disables ordering of parcel_group ("Gemarkung") column on tables
    * ordering can not be done properly due to more complex nature of this column's content
* introduces "Keine Geometrie vorhanden" message instead of hour glass icon on entries where no geometry has been entered yet
* properly orders last_modified column by moving null values to the lower end of the ordering

ema/tables.py

@@ -6,21 +6,18 @@ Created on: 19.08.21
 
 """
 from django.http import HttpRequest
-from django.template.loader import render_to_string
 from django.utils.html import format_html
-from django.utils.timezone import localtime
 from django.utils.translation import gettext_lazy as _
 from django.urls import reverse
 
 import django_tables2 as tables
 
-from konova.sub_settings.django_settings import DEFAULT_DATE_TIME_FORMAT
-from konova.utils.tables import BaseTable, TableRenderMixin
+from konova.utils.tables import BaseTable, TableRenderMixin, TableOrderMixin
 from ema.filters import EmaTableFilter
 from ema.models import Ema
 
 
-class EmaTable(BaseTable, TableRenderMixin):
+class EmaTable(BaseTable, TableRenderMixin, TableOrderMixin):
     """
     Since EMA and compensation are basically the same, we can reuse CompensationTableFilter and extend the EMA filter
     in the future by inheriting.
@@ -37,7 +34,7 @@ class EmaTable(BaseTable, TableRenderMixin):
     )
     d = tables.Column(
         verbose_name=_("Parcel gmrkng"),
-        orderable=True,
+        orderable=False,
         accessor="geometry",
     )
     r = tables.Column(
@@ -93,28 +90,6 @@ class EmaTable(BaseTable, TableRenderMixin):
         )
         return format_html(html)
 
-    def render_d(self, value, record: Ema):
-        """ Renders the parcel district column for a ema
-
-        Args:
-            value (str): The geometry
-            record (Ema): The ema record
-
-        Returns:
-
-        """
-        parcels = value.get_underlying_parcels().values_list(
-            "parcel_group__name",
-            flat=True
-        ).distinct()
-        html = render_to_string(
-            "table/gmrkng_col.html",
-            {
-                "entries": parcels
-            }
-        )
-        return html
-
     def render_r(self, value, record: Ema):
         """ Renders the registered column for a EMA