fix many issues

atlas/models.py

@@ -1379,7 +1379,7 @@ def _populate_case_study_date_on_series_image_save(sender, instance, **kwargs):
     if not instance.series_id:
         return
 
-    tags = instance.basic_dicom_tags or {}
+    tags = getattr(instance, "basic_dicom_tags", None) or {}
     raw_date = tags.get("StudyDate") or tags.get("AcquisitionDate") or tags.get("SeriesDate")
     parsed = Case._parse_dicom_date(raw_date)
     if not parsed:
@@ -1520,6 +1520,14 @@ class Series(SeriesBase):
             self.pk, self.get_examination_full(), self.description, case_id
         )
 
+    def get_viewer_stack_description(self) -> str:
+        description = self.description or str(self.examination or "Series")
+        if self.plane:
+            description = f"{description} ({self.plane})"
+        if self.contrast:
+            description = f"{description} / {self.contrast}"
+        return description
+
     def get_absolute_url(self):
         return reverse("atlas:series_detail", kwargs={"pk": self.pk})
 
@@ -1558,10 +1566,7 @@ class Series(SeriesBase):
             # else:
             #    instances.append(image.get_image_dicom_json(image_index))
 
-        description = f"{self.examination} ({self.plane})"
-        if self.contrast and self.contrast is not None:
-            description = f"{description} / {self.contrast}"
-        series_json["SeriesDescription"] = description
+        series_json["SeriesDescription"] = self.get_viewer_stack_description()
         series_json["instances"] = instances
 
         return series_json