Dealing with EmptyAttributeValues when encoding SAML2Strings

[Max Spicer]

With Idp 4.0.1, we now get quite a few occurrences of this warning:

net.shibboleth.idp.saml.attribute.transcoding.AbstractSAMLAttributeTranscoder
- "Skipping value of attribute 'xxxx'; Type EmptyAttributeValue cannot be
encoded by this encoder (SAML2StringAttributeTranscoder)."

The attribute definition is:
    <AttributeDefinition id="xxxx" xsi:type="Simple">
        <InputAttributeDefinition ref="yyyy" />
        <AttributeEncoder xsi:type="SAML2String"
name="urn:oid:1.2.840.113556.1.4.35" friendlyName="zzzz" />
    </AttributeDefinition>

And the input data connector is of type RelationalDatabase.

The data connector returns nulls for some values so this is just a warning,
but I'm wondering how I can remove it as it does clutter the logs. Can we
filter the null values from being encoded somehow?

Thanks,

Max Spicer
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