Allow skynet properties override and improve dead unit handling

Now the user can override special skynet properties from the unit.yaml of the main Radar of the sam site. Which unit needs these overrides can be looked up over here: https://github.com/walder/Skynet-IADS/blob/develop/skynet-iads-source/skynet-iads-supported-types.lua

- fixed wrong exclusion of groups with the first unit dead but still able to participate
- added some exception handling in the lua script for groups which skynet is not able to control. preventing scripting errors

game/missiongenerator/luagenerator.py

@@ -1,5 +1,4 @@
 from __future__ import annotations
-from collections import defaultdict
 
 import logging
 import os
@@ -15,6 +14,7 @@ from dcs.triggers import TriggerStart
 from game.ato import FlightType
 from game.plugins import LuaPluginManager
 from game.theater import TheaterGroundObject
+from game.theater.iadsnetwork.iadsrole import IadsRole
 from game.utils import escape_string_for_lua
 
 from .aircraft.flightdata import FlightData
@@ -142,6 +142,10 @@ class LuaGenerator:
             iads_type = coalition.get_or_create_item(node.iads_role.value)
             iads_element = iads_type.add_item()
             iads_element.add_key_value("dcsGroupName", node.dcs_name)
+            if node.iads_role in [IadsRole.SAM, IadsRole.SAM_AS_EWR]:
+                # add additional SkynetProperties to SAM Sites
+                for property, value in node.properties.items():
+                    iads_element.add_key_value(property, value)
             for role, connections in node.connections.items():
                 iads_element.add_data_array(role, connections)