Fix migration (#181)

* Fix migration for datastes without files

* Fix handler for raster in case of copy and missing files

Author: mattiagiupponi

importer/handlers/common/raster.py

@@ -504,6 +504,9 @@ def copy_raster_file(
 
     original_dataset = original_dataset.first()
 
+    if not original_dataset.files:
+        raise InvalidGeoTiffException("The original file of the dataset is not available, Is not possible to copy the dataset")
+
     new_file_location = orchestrator.load_handler(handler_module_path).copy_original_file(original_dataset)
 
     new_dataset_alternate = create_alternate(original_dataset.title, exec_id)

importer/migrations/0006_dataset_migration.py

@@ -10,7 +10,13 @@ def dataset_migration(apps, _):
         .exclude(pk__in=NewResources.objects.values_list('resource_id', flat=True))\
         .exclude(subtype__in=['remote', None]):        
         # generating orchestrator expected data file
-        converted_files = [{"base_file": x} for x in old_resource.files]
+        if not old_resource.files:
+            if old_resource.is_vector():
+                converted_files = [{"base_file": "placeholder.shp"}]
+            else:
+                converted_files = [{"base_file": "placeholder.tiff"}]
+        else:
+            converted_files = [{"base_file": x} for x in old_resource.files]
         # try to get the handler for the file of the old resource
         # when is found, we can exit
         handler_to_use = None