Fix logos on iviewer placeholder page via base_url

Author: will-moore

idr_gallery/views.py

@@ -570,6 +570,11 @@ def image_viewer(request, iid, conn=None, **kwargs):
         # "mkngff" data is at https://uk1s3.embassy.ebi.ac.uk/bia-integrator-data/pages/idr_ngff_data.html
         bia_ngff_id = img_path.split(BIA_URL, 1)[-1].split("/", 1)[0]
 
+    if settings.BASE_URL is not None:
+        base_url = settings.BASE_URL
+    else:
+        base_url = request.build_absolute_uri(reverse('index'))
+
     rsp_json = {
         "idr_study": idrid_name,
         "template": "idr_gallery/archived_image.html",
@@ -582,6 +587,7 @@ def image_viewer(request, iid, conn=None, **kwargs):
         "is_zarr": is_zarr,
         "download_url": download_url,
         "bia_ngff_id": bia_ngff_id,
+        "base_url": base_url,
     }
     if image.fileset is not None:
         paths = image.getImportedImageFilePaths()