Bugfixes for GWT

core/src/io/anuke/mindustry/content/Mechs.java

@@ -137,7 +137,7 @@ public class Mechs implements ContentList{
                 boostSpeed = 0.8f;
                 weapon = Weapons.healBlaster;
                 maxSpeed = 5f;
-                armor = 20f;
+                armor = 15f;
                 altChargeAlpha = 0.05f;
                 trailColorTo = Palette.heal;
             }

core/src/io/anuke/mindustry/entities/units/types/Drone.java

@@ -18,6 +18,7 @@ import io.anuke.mindustry.graphics.Palette;
 import io.anuke.mindustry.net.Net;
 import io.anuke.mindustry.type.Item;
 import io.anuke.mindustry.type.ItemStack;
+import io.anuke.mindustry.type.ItemType;
 import io.anuke.mindustry.world.Tile;
 import io.anuke.mindustry.world.blocks.BuildBlock;
 import io.anuke.mindustry.world.blocks.BuildBlock.BuildEntity;
@@ -220,6 +221,12 @@ public class Drone extends FlyingUnit implements BuilderTrait{
                 return;
             }
 
+            if(inventory.getItem().item.type != ItemType.material){
+                inventory.clearItem();
+                setState(mine);
+                return;
+            }
+
             target = getClosestCore();
 
             if(target == null) return;