Hotfix/deprecated urn stored library (#1308)

Co-authored-by: Mohamed-Hacene <[email protected]>

Author: ab-smith

backend/library/utils.py

@@ -586,12 +586,15 @@ def check_and_import_dependencies(self):
             return None
         for dependency_urn in self._library.dependencies:
             if not LoadedLibrary.objects.filter(urn=dependency_urn).exists():
-                dependency = StoredLibrary.objects.get(
-                    urn=dependency_urn
-                )  # We only fetch by URN without thinking about what locale, that may be a problem in the future.
-                error_msg = dependency.load()
-                if error_msg is not None:
-                    return error_msg
+                try:
+                    dependency = StoredLibrary.objects.get(urn=dependency_urn)
+                    error_msg = dependency.load()
+                    if error_msg is not None:
+                        return error_msg
+                except StoredLibrary.DoesNotExist:
+                    err_msg = f"ERROR: Stored Library with URN {dependency_urn} does not exist"
+                    print(err_msg)
+                    raise Http404(err_msg)
             else:
                 # try to update the dependency, because we might need the last version for the main library
                 dependency = LoadedLibrary.objects.get(urn=dependency_urn)