Fix: image_detector skip None values in casted_versions (#4956)

* Fix: image_detector

* Filter None in other util

Author: benieric

src/sagemaker/image_uri_config/xgboost.json

@@ -1,7 +1,7 @@
 {
     "inference": {
         "version_aliases": {
-            "latest": "1.7-1"
+            "latest": "1"
         },
         "versions": {
             "1": {

src/sagemaker/serve/detector/image_detector.py

@@ -43,7 +43,7 @@ def auto_detect_container(model, region: str, instance_type: str) -> str:
     casted_versions = _cast_to_compatible_version(fw, fw_version) if fw_version else (None,)
     dlc = None
 
-    for casted_version in casted_versions:
+    for casted_version in filter(None, casted_versions):
         try:
             dlc = image_uris.retrieve(
                 framework=fw,

src/sagemaker/serve/model_format/mlflow/utils.py

@@ -350,7 +350,7 @@ def _select_container_for_mlflow_model(
     )
 
     image_uri = None
-    for casted_version in casted_versions:
+    for casted_version in filter(None, casted_versions):
         try:
             image_uri = image_uris.retrieve(
                 framework=framework_to_use,