Adjust to the new InvenioRDM release

* some parts from invenio-rdm-records were refactored and moved into
  invenio-app-rdm

invenio_config_tuw/config.py

@@ -212,7 +212,7 @@ try:
     try:
         from invenio_theme_tuw.config import RECORDS_UI_ENDPOINTS
     except ModuleNotFoundError:
-        from invenio_rdm_records.config import RECORDS_UI_ENDPOINTS
+        from invenio_app_rdm.config import RECORDS_UI_ENDPOINTS
 
     RECORDS_UI_ENDPOINTS.get("recid_files", {}).update(recid_files)
     RECORDS_UI_ENDPOINTS.get("recid_previewer", {}).update(recid_previewer)

invenio_config_tuw/views.py

@@ -3,7 +3,7 @@ from invenio_files_rest.views import ObjectResource
 from invenio_previewer import current_previewer
 from invenio_previewer.api import PreviewFile
 from invenio_previewer.extensions import default
-from invenio_rdm_records.utils import previewer_record_file_factory
+from invenio_app_rdm.theme.utils import previewer_record_file_factory
 
 from .utils import check_permission
 
@@ -78,7 +78,10 @@ def preview(pid, record, template=None, **kwargs):
     file_previewer = fileobj.get("previewer")
 
     # Find a suitable previewer
-    fileobj["size"] = fileobj.file.size  # fixes the KeyError in plugin.can_preview()
+    if fileobj.get("size") is None:
+        # in older releases, the "size" key wasn't set
+        fileobj["size"] = fileobj.file.size
+
     fileobj = PreviewFile(pid, record, fileobj)
     for plugin in current_previewer.iter_previewers(
         previewers=[file_previewer] if file_previewer else None