fix: do not error if missing fields

The lib was validating the fields in the databag, causing any
differences in versions between the provider/requirer libs to throw an
exception

Author: nsklikas

lib/charms/identity_platform_login_ui_operator/v0/login_ui_endpoints.py

@@ -52,7 +52,7 @@ def some_event_function():
 
 # Increment this PATCH version before using `charmcraft publish-lib` or reset
 # to 0 if you are raising the major API version
-LIBPATCH = 1
+LIBPATCH = 2
 
 RELATION_NAME = "ui-endpoint-info"
 INTERFACE_NAME = "login_ui_endpoints"
@@ -155,14 +155,6 @@ def __init__(self) -> None:
         super().__init__(self.message)
 
 
-class LoginUIEndpointsRelationDataMissingError(LoginUIEndpointsRelationError):
-    """Raised when information is missing from the relation."""
-
-    def __init__(self, message: str) -> None:
-        self.message = message
-        super().__init__(self.message)
-
-
 class LoginUIEndpointsRequirer(Object):
     """Requirer side of the ui-endpoint-info relation."""
 
@@ -187,9 +179,4 @@ def get_login_ui_endpoints(self, relation_id=None) -> Dict:
 
         ui_endpoint_relation_data = ui_endpoint_relation.data[ui_endpoint_relation.app]
 
-        if any(not ui_endpoint_relation_data.get(k := key) for key in RELATION_KEYS):
-            raise LoginUIEndpointsRelationDataMissingError(
-                f"Missing endpoint {k} in ui-endpoint-info relation data"
-            )
-
         return ui_endpoint_relation_data