LogFormatter: Don't return a non-array from formatParameterValueForApi

LogFormatter: Don't return a non-array from formatParameterValueForApi

If the title for a 'title' or 'title-link' type is invalid, the code
still must not return a non-array from the method.

I'm not sure this is what was behind T176938, but it's the only thing I
can find that might cause the errors I saw logged at about the same
time.

Change-Id: Iae77eb6ad9a64d8b67074164ff0c0fea36826f3c