feat: add error message page; improve admin ui; add missing test files

aircox/views/base.py

@@ -1,3 +1,4 @@
+from django.http import HttpResponseRedirect
 from django.urls import reverse
 from django.views.generic.base import ContextMixin, TemplateResponseMixin
 
@@ -60,6 +61,11 @@ class BaseView(TemplateResponseMixin, ContextMixin):
 
         return super().get_context_data(**kwargs)
 
+    def dispatch(self, *args, **kwargs):
+        if not self.request.station:
+            return HttpResponseRedirect(reverse("errors-no-station"))
+        return super().dispatch(*args, **kwargs)
+
 
 # FIXME: rename to sth like [Base]?StationAPIView/Mixin
 class BaseAPIView: