YError exception not raised as expected

[111pontes]

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Expected Behavior

YDK should generate YError exceptions.

Current Behavior

YDK generates RuntimeError exception when an invalid namespace is sent in a NETCONF subtree filter.

Steps to Reproduce

Using Path API, send a NETCONF get RPC with filter:

<netconf-state xmlns="urn:ietf:params:xml:ns:yang:ietf-netconf-monitoring2">
  <schemas/>
</netconf-state>

Logs

RuntimeError: YServiceProviderError: <?xml version="1.0"?>
<rpc-reply xmlns="urn:ietf:params:xml:ns:netconf:base:1.0" message-id="1">
  <rpc-error>
    <error-type>protocol</error-type>
    <error-tag>unknown-namespace</error-tag>
    <error-severity>error</error-severity>
    <error-info>
      <bad-element>netconf-state</bad-element>
      <bad-namespace>urn:ietf:params:xml:ns:yang:ietf-netconf-monitoring2</bad-namespace>
    </error-info>
  </rpc-error>
</rpc-reply>

System Information

$ python --version
Python 3.5.2
$ pip list | grep ydk
ydk                     0.7.1
ydk-models-cisco-ios-xr 6.3.2
ydk-models-ietf         0.1.5
$

[ygorelik]

Could not reproduce after #774 got fixed.