Fix KeyError handling when retrieving current model version number

Author: safoinme

train_and_deploy/steps/promotion/compute_performance_metrics_on_current_data.py

@@ -63,8 +63,8 @@ def compute_performance_metrics_on_current_data(
 
     latest_version_number = latest_version.number
 
-    current_version = Model(name=latest_version.name, version=target_env)
     try:
+        current_version = Model(name=latest_version.name, version=target_env)
         current_version_number = current_version.number
     except KeyError:
         current_version_number = None