fix: Remove check on serving_container_image_uri when artifact_uri and local_model is given

COPYBARA_INTEGRATE_REVIEW=#4558 from rragundez:patch-1 d7ff12e PiperOrigin-RevId: 696672287

Author: rragundez

google/cloud/aiplatform/models.py

@@ -5020,7 +5020,9 @@ def upload(
  if not model_dir.exists():
  raise ValueError(f"artifact_uri path does not exist: '{artifact_uri}'")
  PREBUILT_IMAGE_RE = "(us|europe|asia)-docker.pkg.dev/vertex-ai/prediction/"
- if re.match(PREBUILT_IMAGE_RE, serving_container_image_uri):
+ if serving_container_image_uri and re.match(
+ PREBUILT_IMAGE_RE, serving_container_image_uri
+ ):
  if not model_dir.is_dir():
  raise ValueError(
  f"artifact_uri path must be a directory: '{artifact_uri}' when using prebuilt image '{serving_container_image_uri}'"