[Users] How to check destination set after branch_route?

[Papadopoulos Georgios]

Hello,

I am trying to filter out requests going to some IPs. So, I have a
branch_route block where I drop the branches that go to the IPs 
I want to block. After the t_on_branch command I call t_relay. This
works fine if the callee has registered with at least one "good" IP.
If the callee has registered with only one IP which I want to block then
there is only one branch that is getting droped. The following
t_relay results in a 500 Server error.

Is there a way to check if all branches have been dropped? I tried using
isdsturiset() but it did not work. 
Even if there is only one branch and this branch has been dropped,
isdsturiset() returns true. Is this correct or am I wrong somewhere?

thank you for any help

George

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