Attempt to fix web viewer being unable to load NBT

lib/data.dart

@@ -264,6 +264,7 @@ class SessionData {
 
     Map<String, dynamic> payload = {
       "cmd": "create",
+      "type": "nbt",
       "data": base64Encoder.encode(nbtData),
     };
 
@@ -444,6 +445,7 @@ class SessionData {
       if (cType == "application/json") {
         return LoadData(reply.data as Map<String, dynamic>);
       } else if (cType == "application/nbt") {
+        print("Data is in NBT Format");
         Uint8List lst = base64Encoder.decode(reply.data as String);
         // Convert this to a CompoundTag
         CompoundTag ct = await NbtIo.readFromStream(lst) as CompoundTag;
@@ -451,7 +453,11 @@ class SessionData {
         return true;
       } else
         return false;
-    } catch (E) {
+    } catch (E, stack) {
+      print(E);
+
+      print(stack);
+
       return false;
     }
   }