perf: Don't update city stats at *end turn* when unassigning extra population (won't affect anything until next turn where we'll recalc anyway)

core/src/com/unciv/logic/city/City.kt

@@ -411,8 +411,7 @@ class City : IsPartOfGameInfoSerialization, INamed {
         hasSoldBuildingThisTurn = true
 
         population.unassignExtraPopulation() // If the building provided specialists, release them to other work
-        population.autoAssignPopulation()
-        cityStats.update()
+        population.autoAssignPopulation() // also updates city stats
         civ.cache.updateCivResources() // this building could be a resource-requiring one
     }
 

core/src/com/unciv/logic/city/managers/CityPopulationManager.kt

@@ -131,6 +131,7 @@ class CityPopulationManager : IsPartOfGameInfoSerialization {
         val freePopulation = getFreePopulation()
         if (freePopulation < 0) {
             unassignExtraPopulation()
+            city.cityStats.update()
         } else {
             autoAssignPopulation()
         }
@@ -267,8 +268,6 @@ class CityPopulationManager : IsPartOfGameInfoSerialization {
                 }
             }
         }
-
-        city.cityStats.update()
     }
 
     fun getMaxSpecialists(): Counter<String> {

core/src/com/unciv/logic/civilization/Civilization.kt

@@ -536,7 +536,7 @@ class Civilization : IsPartOfGameInfoSerialization {
             yieldAll(religionManager.religion!!.founderBeliefUniqueMap.getMatchingUniques(uniqueType, stateForConditionals))
 
         yieldAll(getCivResourceSupply().asSequence()
-            .filter { it.amount > 0 }
+            .filter { it.amount > 0 && it.resource.uniques.isNotEmpty() }
             .flatMap { it.resource.getMatchingUniques(uniqueType, stateForConditionals) }
         )