Handle no preloading

Author: grzegorz-roboflow

inference/core/interfaces/webrtc_worker/modal.py

@@ -114,8 +114,8 @@
             "MODELS_CACHE_AUTH_ENABLED": str(MODELS_CACHE_AUTH_ENABLED),
             "LOG_LEVEL": LOG_LEVEL,
             "ONNXRUNTIME_EXECUTION_PROVIDERS": "[CUDAExecutionProvider,CPUExecutionProvider]",
-            "PRELOAD_HF_IDS": str(PRELOAD_HF_IDS),
-            "PRELOAD_MODELS": str(PRELOAD_MODELS),
+            "PRELOAD_HF_IDS": str(PRELOAD_HF_IDS) if PRELOAD_HF_IDS else "",
+            "PRELOAD_MODELS": str(PRELOAD_MODELS) if PRELOAD_MODELS else "",
             "PROJECT": PROJECT,
             "ROBOFLOW_INTERNAL_SERVICE_NAME": WEBRTC_MODAL_ROBOFLOW_INTERNAL_SERVICE_NAME,
             "ROBOFLOW_INTERNAL_SERVICE_SECRET": ROBOFLOW_INTERNAL_SERVICE_SECRET,