I was wondering if this is a bug or a known change that I just happened to miss. I used to be able to tell if a plugin or hotspot existed by doing this:
Note that I'm not calling a specific attribute of the spot object. I'm not sure when this stopped working but now all I receive when doing this with plugins and hotspots is an error that says "Error in Actionscript. Use a try/catch block to find error."
I tried it on a data object and it worked fine with no errors, it just returned the object as expected.