Removing pydantic from NBI charm

Change-Id: I725aabf1da99751dae0812305e01d92b801653ee
Signed-off-by: sousaedu <eduardo.sousa@canonical.com>
diff --git a/installers/charm/nbi/src/charm.py b/installers/charm/nbi/src/charm.py
index 3970a33..6db99be 100755
--- a/installers/charm/nbi/src/charm.py
+++ b/installers/charm/nbi/src/charm.py
@@ -22,7 +22,6 @@
 
 import logging
 from typing import Any, Dict, NoReturn
-from pydantic import ValidationError
 
 from ops.charm import CharmBase, CharmEvents
 from ops.framework import EventBase, EventSource, StoredState
@@ -374,7 +373,7 @@
                 self.model.app.name,
                 self.port,
             )
-        except ValidationError as exc:
+        except ValueError as exc:
             logger.exception("Config/Relation data validation error")
             self.unit.status = BlockedStatus(str(exc))
             return