Skip private mdoel loading test for external contributors (#1082)

Author: echarlaix

tests/openvino/test_modeling.py

@@ -395,7 +395,7 @@ def test_load_from_hub_and_save_stable_diffusion_model(self):
     def test_load_model_from_hub_private_with_token(self):
         model_id = "optimum-internal-testing/tiny-random-phi-private"
         token = os.environ.get("HF_HUB_READ_TOKEN", None)
-        if token is None:
+        if not token:
             self.skipTest("Test requires a token `HF_HUB_READ_TOKEN` in the environment variable")
 
         model = OVModelForCausalLM.from_pretrained(model_id, token=token, revision="openvino")