fix error when no storage option is set during enablement

Author: NedAnd1

src/azure-cli/azure/cli/command_modules/acs/azurecontainerstorage/acstor_ops.py

@@ -701,14 +701,17 @@ def perform_azure_container_storage_update(
     if not delete_extension:
         config_settings = []
 
-        if storage_options_to_remove and CONST_STORAGE_POOL_TYPE_EPHEMERAL_DISK in storage_options_to_remove:
+        storage_options_to_add = storage_options_to_add if isinstance(storage_options_to_add, (list, str)) else []
+        storage_options_to_remove = storage_options_to_remove if isinstance(storage_options_to_remove, (list, str)) else []
+
+        if CONST_STORAGE_POOL_TYPE_EPHEMERAL_DISK in storage_options_to_remove:
             config_settings.append({"csiDriverConfigs.local-csi-driver.enabled": "False"})
-        elif storage_options_to_add and CONST_STORAGE_POOL_TYPE_EPHEMERAL_DISK in storage_options_to_add:
+        elif CONST_STORAGE_POOL_TYPE_EPHEMERAL_DISK in storage_options_to_add:
             config_settings.append({"csiDriverConfigs.local-csi-driver.enabled": "True"})
 
-        if storage_options_to_remove and CONST_STORAGE_POOL_TYPE_ELASTIC_SAN in storage_options_to_remove:
+        if CONST_STORAGE_POOL_TYPE_ELASTIC_SAN in storage_options_to_remove:
             config_settings.append({"csiDriverConfigs.azuresan-csi-driver.enabled": "False"})
-        elif storage_options_to_add and CONST_STORAGE_POOL_TYPE_ELASTIC_SAN in storage_options_to_add:
+        elif CONST_STORAGE_POOL_TYPE_ELASTIC_SAN in storage_options_to_add:
             config_settings.append({"csiDriverConfigs.azuresan-csi-driver.enabled": "True"})
 
         try: