Throwing exception can shorten tree

[Michael Mann <mmann78 () netscape net>]

I can't remember where I had the conversation, but I remember talking about cases where a thrown exception in Wireshark 
leads to it not showing as much as was dissected in the tree. I remember first seeing this issue when I was writing 
some dissector code and it wasn't quite finished, so I had some incorrectly created malformed packets.  And I think 
that's where I keep seeing the issue (during development), so I've never been able to easily share the setup.

Well, I think bug 13435 (https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=13435) provides an example of this.  I've 
been stepping through the provided capture (packet 74 to be specific) in the debugger and can see that it creates much 
more of a tree than is shown in the GUI.  I'm not sure if its a "bug" or a "feature", but it only seems to happen for 
malformed packets (or similar), so it's never the "real" bug and just an annoying symptom.  But that symptom can make 
it harder to track down the real bug because the tree isn't really showing the last field it dissected.  If someone 
could provide an explanation of "why" that would be appreciated.

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