Fix ProjectItemResource.path in case the resource's URL is None

spine_engine/project_item/project_item_resource.py

@@ -159,13 +159,12 @@ def url(self):
     def url(self, url):
         self._url = url
         self._parsed_url = urlparse(self._url)
-        self._filepath = url2pathname(self._parsed_url.path)
 
     @property
     def path(self):
         """Returns the resource path in the local syntax, as obtained from parsing the url."""
         if not self._filepath:
-            self._filepath = url2pathname(self._parsed_url.path)
+            self._filepath = url2pathname(self._parsed_url.path) if self._parsed_url.path else ""
         return self._filepath
 
     @property

tests/project_item/test_project_item_resource.py

@@ -138,6 +138,17 @@ def test_schema_is_stored_in_metadata(self):
         resource = url_resource("project item", "sqlite:///path/do/db.sqlite", "my database", schema="my_schema")
         self.assertEqual(resource.metadata, {"schema": "my_schema"})
 
+    def test_url_setter_works_when_url_is_set_to_none(self):
+        resource = url_resource("project item", "sqlite:///path/do/db.sqlite", "my database")
+        resource.url = None
+        self.assertIsNone(resource.url)
+
+
+class TestTransientFileResource(unittest.TestCase):
+    def test_path_works_even_when_resource_has_no_url(self):
+        resource = transient_file_resource("Provider", "files@Provider")
+        self.assertEqual(resource.path, "")
+
 
 class TestGetSource(unittest.TestCase):
     def test_file_resource(self):