Updated error message. (#796)

Author: lu-ohai

ads/aqua/__init__.py

@@ -8,7 +8,7 @@
 import sys
 import os
 from ads.aqua.utils import fetch_service_compartment
-from ads.config import OCI_RESOURCE_PRINCIPAL_VERSION
+from ads.config import NB_SESSION_OCID, OCI_RESOURCE_PRINCIPAL_VERSION
 from ads import set_auth
 
 logger = logging.getLogger(__name__)
@@ -22,7 +22,15 @@
 if not ODSC_MODEL_COMPARTMENT_OCID:
     try:
         ODSC_MODEL_COMPARTMENT_OCID = fetch_service_compartment()
-    except Exception as e:
+    except:
+        pass
+
+if not ODSC_MODEL_COMPARTMENT_OCID:
+    logger.error(
+        f"ODSC_MODEL_COMPARTMENT_OCID environment variable is not set for Aqua."
+    )
+    if NB_SESSION_OCID:
         logger.error(
-            f"ODSC_MODEL_COMPARTMENT_OCID environment variable is not set for Aqua, due to {e}."
+            f"Aqua is not available for this notebook session {NB_SESSION_OCID}."
         )
+    exit()