Added some nullchecks for queen existance, fixing #60

CHANGELOG.md

@@ -18,6 +18,7 @@
 - Copy of Infis patch for eating cum from sexperience, #41 and #48
 - Updated some Icons to have better backgrounds (thanks @WasmachenDennSachenSo #53)
 - Custom Queen- and Drone-Xenotypes should work now. 
+- Some more checks if Queen is on Map or not (fixing #60)
 
 *Notes*: 
 The pawns that are gender fluid can get pregnant. 

Source/Genes/Hive/Helpers/HiveUtility.cs

@@ -61,6 +61,9 @@ namespace RJW_Genes
         /// <returns>True if the pawn is on the home-map, False otherwise.</returns>
         public static bool PawnIsOnHomeMap(Pawn pawn)
         {
+            if  (Find.Maps.NullOrEmpty() || !Find.Maps.Where(mapCandidate => mapCandidate.IsPlayerHome).Any()) { 
+                return false; 
+            }
             Map homeMap = Find.Maps.Where(mapCandidate => mapCandidate.IsPlayerHome).First();
             return
                 homeMap != null && pawn != null