[Backport] Importing valid project without slug

taiga/export_import/api.py

@@ -205,7 +205,8 @@ class ProjectImporterViewSet(mixins.ImportThrottlingPolicyMixin, CreateModelMixi
         except Exception:
             raise exc.WrongArguments(_("Invalid dump format"))
 
-        if Project.objects.filter(slug=dump['slug']).exists():
+        slug = dump.get('slug', None)
+        if slug is not None and Project.objects.filter(slug=slug).exists():
             del dump['slug']
 
         if settings.CELERY_ENABLED:

tests/integration/test_importer_api.py

@@ -1059,3 +1059,21 @@ def test_dump_import_throttling(client, settings):
     assert response.status_code == 201
     response = client.post(url, {'dump': data})
     assert response.status_code == 429
+
+
+def test_valid_dump_import_without_slug(client):
+    project = f.ProjectFactory.create(slug="existing-slug")
+    user = f.UserFactory.create()
+    client.login(user)
+
+    url = reverse("importer-load-dump")
+
+    data = ContentFile(bytes(json.dumps({
+        "name": "Project name",
+        "description": "Valid project desc",
+        "is_private": True
+    }), "utf-8"))
+    data.name = "test"
+
+    response = client.post(url, {'dump': data})
+    assert response.status_code == 201