Data system errors if a schema migration function returns a non-table

[NobleDraconian]

Currently, as of v2.1.0, if a schema migration function returns nil or some other non-table value, the LoadData API does not account for this and hits a fatal error, halting the entire system:

ReplicatedStorage.Packages._Index.nobledraconian_roblox-libmodules@3.1.0.roblox-libmodules.lib.Utils.Table.ConvertTableToFolder:5: invalid argument #1 to 'pairs' (table expected, got nil) - ConvertTableToFolder:5
  Stack Begin
  Script 'ReplicatedStorage.Packages._Index.nobledraconian_roblox-libmodules@3.1.0.roblox-libmodules.lib.Utils.Table.ConvertTableToFolder', Line 5 - function ConvertTableToFolder - ConvertTableToFolder:5
  Script 'ServerScriptService.Packages._Index.phoenixentertainment_playerdatasystem-server@2.0.0.playerdatasystem-server', Line 73 - function CreateDataCache - playerdatasystem-server:73
  Script 'ServerScriptService.Packages._Index.phoenixentertainment_playerdatasystem-server@2.0.0.playerdatasystem-server', Line 899 - function LoadPlayerDataIntoServer - playerdatasystem-server:899
  Script 'ServerScriptService.Packages._Index.phoenixentertainment_playerdatasystem-server@2.0.0.playerdatasystem-server', Line 1041 - playerdatasystem-server:1041
  Script 'ReplicatedStorage.Packages._Index.nobledraconian_roblox-libmodules@3.1.0.roblox-libmodules.lib.Classes.Queue', Line 90 - function Execute - Queue:90
  Script 'ServerScriptService.Packages._Index.phoenixentertainment_playerdatasystem-server@2.0.0.playerdatasystem-server', Line 1050 - function PlayerJoined - playerdatasystem-server:1050
  Stack End

A nil or some other non-table value being returned by a schema migration function should instead go through the same error codepath as the schema migration function itself erroring.