Add null check for connect road cross-version saves (#10699)

* Add null checks to fix #10691

* Issue reference unnecessary

core/src/com/unciv/logic/automation/unit/WorkerAutomation.kt

@@ -139,6 +139,7 @@ class WorkerAutomation(
     fun automateConnectRoad(unit: MapUnit, tilesWhereWeWillBeCaptured: Set<Tile>){
         if (actualBestRoadAvailable == RoadStatus.None) return
 
+
         var currentTile = unit.getTile()
 
         /** Reset side effects from automation, return worker to non-automated state*/
@@ -150,6 +151,11 @@ class WorkerAutomation(
             currentTile.stopWorkingOnImprovement()
         }
 
+        if (unit.automatedRoadConnectionDestination == null){
+            stopAndCleanAutomation()
+            return
+        }
+
         /** Conditions for whether it is acceptable to build a road on this tile */
         fun shouldBuildRoadOnTile(tile: Tile): Boolean {
             return !tile.isCityCenter() // Can't build road on city tiles

core/src/com/unciv/ui/screens/worldscreen/WorldMapHolder.kt

@@ -791,6 +791,7 @@ class WorldMapHolder(
         // Z-Layer: 4
         // Highlight road path for workers currently connecting roads
         if (unit.isAutomatingRoadConnection()) {
+            if (unit.automatedRoadConnectionPath == null) return
             val currTileIndex = unit.automatedRoadConnectionPath!!.indexOf(unit.currentTile.position)
             if (currTileIndex != -1) {
                 val futureTiles = unit.automatedRoadConnectionPath!!.filterIndexed { index, _ ->