fix NPE when reading sponge schematics with tile entities or entities

worldedit-core/src/main/java/com/sk89q/worldedit/extent/clipboard/io/SpongeSchematicReader.java

@@ -210,6 +210,7 @@ public class SpongeSchematicReader extends NBTSchematicReader {
         });
         streamer.readFully();
         if (fc == null) setupClipboard(length * width * height, uuid);
+        else fc.setDimensions(new Vector(width, height, length));
         Vector origin = min;
         CuboidRegion region;
         if (offsetX != Integer.MIN_VALUE && offsetY != Integer.MIN_VALUE  && offsetZ != Integer.MIN_VALUE) {
@@ -242,7 +243,6 @@ public class SpongeSchematicReader extends NBTSchematicReader {
                 }
             }
         }
-        fc.setDimensions(new Vector(width, height, length));
         clipboard.init(region, fc);
         clipboard.setOrigin(origin);
         return clipboard;