Added min-game-version 105 enforcement

core/src/mindustry/logic/LAccess.java

@@ -15,6 +15,7 @@ public enum LAccess{
     powerNetIn,
     powerNetOut,
     health,
+    maxHealth,
     heat,
     efficiency,
     rotation,

core/src/mindustry/logic/LExecutor.java

@@ -493,7 +493,9 @@ public class LExecutor{
             //this should avoid any garbage allocation
             Var v = exec.vars[value];
             if(v.isobj && value != 0){
-                String strValue = v.objval instanceof String ? (String)v.objval : v.objval == null ? "null" :
+                String strValue =
+                    v.objval == null ? "null" :
+                    v.objval instanceof String ? (String)v.objval :
                     v.objval instanceof Content ? "[content]" :
                     v.objval instanceof Building ? "[building]" :
                     v.objval instanceof Unit ? "[unit]" :