Invalid leaf names do not trigger a YDK exception

[djsmith20171]

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Expected Behavior

We expect YDK exception for invalid leaf names.

Current Behavior

Python programs runs successfully without exceptions - which is incorrect. Invalid leaf is silently ignored during XML encoding.

Steps to Reproduce

Easy to reproduce by mistyping a leaf name.

Your Script

from argparse import ArgumentParser
import urllib.parse
# from urlparse import urlparse

from ydk.services import CRUDService
from ydk.providers import NetconfServiceProvider
from ydk.models.cisco_ios_xr import Cisco_IOS_XR_mpls_lsd_cfg \
    as xr_mpls_lsd_cfg
from ydk.types import Empty
import logging


def config_mpls_lsd(mpls_lsd):
    """Add config data to mpls_lsd object."""
    mpls_lsd.mpls_ip_ttl_propagate_disable = xr_mpls_lsd_cfg.MplsIpTtlPropagateDisable.all
    # mpls_lsd.app_reg_delay_disable = Empty()
 
    # Line below uses incorrect leaf name (agg_reg_delay_disable) instead of 
    # the correct leaf name above (app_reg_delay_disable).  No exception is generated when the
    # object is encoded.  
    mpls_lsd.agg_reg_delay_disable = Empty()
    mpls_lsd.ltrace_multiplier = 2
    mpls_lsd.mpls_entropy_label = Empty()

Logs

Enable logging and post the logs below

<mpls-lsd xmlns="http://cisco.com/ns/yang/Cisco-IOS-XR-mpls-lsd-cfg" xmlns:nc="urn:ietf:params:xml:ns:netconf:base:1.0" nc:operation="merge">
  <ltrace-multiplier>2</ltrace-multiplier>
  <mpls-entropy-label/>
</mpls-lsd>

System Information

admin@controller:md-sdk$ pip list | grep ydk
ydk                     0.7.1
ydk-models-cisco-ios-xr 6.3.2
ydk-models-ietf         0.1.5

[ghost]

Fixed in #820