diagnose WARN message

[Rod Widdowson]

> I did find some null values in UII and Contacts in locally maintained vendor-provided metadata; but removing those does not remove the warnings. 

You don't need to hear this, but it almost certainly means that you have missed some.  Note that <DisplayName/> and <DisplayName></DisplayName> will produce the same errors.

For the record:

> WARN [] net.shibboleth.idp.saml.metadata.IdPUIInfo:93 >  Ignoring empty string in <IdpUIInfo/>

Will be provoked by
	
	DisplayName
	Description

And

> WARN [] net.shibboleth.idp.saml.metadata.IdPUIInfo:77 >  Ignoring empty URUI in <IdpUIInfo/>
(typo now fixed)

by
	InformationURL
	PrivacyStatementURL

Empty <Logo> statements provoke a different warning.

I have entered an JIRA case[1] to improve the logging.

Rod

[1] https://issues.shibboleth.net/jira/browse/IDP-1835