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Description of problem:
A problem with our importer caused Links to be imported without the
associated link item (in APLAWS, the Related Links authoring step).
Specifically it was an internal link, but both target_uri and
target_item_id were null.

Obviously this is a problem with the importer which we'll fix, however
its possible using only published APIs to create a Link in this state.
Such a link causes the Related Links authoring step to give a stack
trace, which isn't helpful.

I'll attach my patch to a comment. It simply outputs a log message at
ERROR level indicating the invalid Link object instead of throwing a
stack trace.

Version-Release number of selected component (if applicable):


How reproducible:
Always

Steps to Reproduce:
1. blah
2.
3.
    

Additional info: