Building priority fix

core/src/mindustry/entities/comp/BuilderComp.java

@@ -69,12 +69,9 @@ abstract class BuilderComp implements Posc, Teamc, Rotc{
         }
 
         Building core = core();
-        BuildPlan current = buildPlan();
 
         //nothing to build.
-        if(current == null) return;
-
-        Tile tile = current.tile();
+        if(buildPlan() == null) return;
 
         //find the next build request
         if(plans.size > 1){
@@ -87,6 +84,9 @@ abstract class BuilderComp implements Posc, Teamc, Rotc{
             }
         }
 
+        BuildPlan current = buildPlan();
+        Tile tile = current.tile();
+
         lastActive = current;
         buildAlpha = 1f;
         if(current.breaking) lastSize = tile.block().size;