Fix when xcschemes.autogeneration_config.test is not set (#3108)

Signed-off-by: Brentley Jones <[email protected]>

Author: brentleyjones

xcodeproj/internal/xcodeproj_incremental_rule.bzl

@@ -219,7 +219,7 @@ def _write_autogeneration_config_file(
     args = actions.args()
     args.set_param_file_format("multiline")
 
-    args.add_all(config.get("test_options"))
+    args.add_all(config.get("test_options"), ["", ""])
     args.add_all(
         config.get("scheme_name_exclude_patterns", []),
         omit_if_empty = False,