[Companion] Lost toolbar with FF 1.0RC1 and 0.5.4

[Brian]

Brian Erst wrote:

>A completely blank bar usually means that the toolbar is having some
>problem with the Yahoo! stream. I fairly regularly have problems with
>my DNS at work, and it causes the exact same problem.
>
>It may be that you are periodically having some problem with the data
>feed coming out of Yahoo!, which is different (I think) from the
>missing icons (text?) that other people are reporting. This doesn't
>necessarily mean that the problem doesn't lie in Companion (we might
>have a data feed bug), but it sounds different than the other issue.
>  
>
I was thinking along those lines.  If that is the case, we need to 
detect the bad feed and stop the rebuild until we get a good feed.  The 
refresh timer has already been set, so the only effect of the change 
would be to keep the old toolbar around.

It should not be difficult to detect, in the feed parser, that the 
stream is bad, and skip the call to CompanionDisplayer.  I think that if 
the 'notext' parameter is missing, e.g., it would indicate a bad feed.