Thwart the nathty dithband thpammer (#11790)

core/src/com/unciv/logic/map/mapunit/MapUnit.kt

@@ -933,6 +933,9 @@ class MapUnit : IsPartOfGameInfoSerialization {
     }
 
     fun disband() {
+        // Safeguard against running on already destroyed instances
+        if (isDestroyed) return
+
         // evacuation of transported units before disbanding, if possible. toListed because we're modifying the unit list.
         for (unit in currentTile.getUnits()
                 .filter { it.isTransported && isTransportTypeOf(it) }

core/src/com/unciv/ui/screens/worldscreen/unit/actions/UnitActionsTable.kt

@@ -60,6 +60,7 @@ class UnitActionsTable(val worldScreen: WorldScreen) : Table() {
         }
 
         clear()
+        keyShortcuts.clear()
         if (unit == null) return
         if (!worldScreen.canChangeState) return // No actions when it's not your turn or spectator!
 
@@ -127,7 +128,6 @@ class UnitActionsTable(val worldScreen: WorldScreen) : Table() {
         pack()
 
         // Bind all currently invisible actions to their keys
-        keyShortcuts.clear()
         for (page in pageActionBuckets.indices) {
             if (page == currentPage) continue // these are already done
             for (unitAction in pageActionBuckets[page]) {