Simple way to avoid null pointer when showing terminal blocks on hud?

Not all terminal blocks have the "ShowOnHUD" value to set, and thus if you do

foreach(IMyTerminalBlock block in blocklist) {
if (damaged) block.SetValue("ShowOnHUD", true);
}

it will invariably throw a null pointer or whatever.

Is there a simple way to use IMyTerminalBlock.GetProperties or whatever to easily tell if a block has that function before I try to apply it?

I tried enclosing the action in a try catch, but the execution would still fail.