Problem with llGetParcelFlags - rezzing objects

I need to check land permissions to see if my object can rez other objects. I rent, but do not own, land which is set to allow object creation by my group only. When I use llGetParcelFlags to check PARCEL_FLAG_ALLOW_CREATE_OBJECTS it always returns false, presumably because the permissions on my parcel don't allow just anyone to build there.

How would I get my function to return true on my rented parcel, where I do have permissions to build, and false on other parcels where I don't?

You never will.
You do not have permission to build as an individual but only as a groupmember.
Your builds however do belong to you and not to the group. Therefore it's impossible for the object to rezz anything. If you want a prim to be able to rezz something on land with 'groupmember object creation only' you need to deed that prim to the group.

I do hope the above answers your question.

Thanks. It does answer the question, but it wasn't what I wanted to hear.

Do we have any sort of "try" structure? Mostly all I want is to avoid the script errors that pop up.

You can build and try anything you want in a sandbox.

I'm building something that has a follower script in it, and also rezzes objects occasionally. When I cross into land that isn't mine, I don't want it to send me errors about how it can't rez things, I just want it to stop trying. I'll try deeding the object to my group, that might take care of it.

LSL seems to have some limitations though. I wish we had either a "try" structure, or a way to disable the error dialogs so the script would fail silently. Either one would work here.