CTD possibly from Concelament reveal command

[GarretSidzaka]

• [ YES ] Verify that this issue is related to Torch and not a Torch plugin or the vanilla game
• [ YES ] Ensure that the issue is reproducible for testing (provide a link to a test world if necessary)
• [ NO ] Is this a suggestion?

Torch Version: 1.3.1.213-master SE Version: latest

Expected Behavior

When my automation uses "!reveal all" it should remove concealment for a while

Observed Behavior

When the command runs, it intermittently CTD from the reveal command, saying some of the grids are already revealed.

Steps to Reproduce

1. Intermittently with "!reveal all"
2. Use reveal all in essentials automation. 1/5 times it crashes

Other Information

19:00:05.8076 [WARN] Concealment: Attempted to reveal a group that wasn't concealed: Mojo Earth HQ
19:00:05.8076 [WARN] Concealment: at Concealment.ConcealmentPlugin.RevealGroup(ConcealGroup group)
at Concealment.ConcealmentPlugin.RevealAll()
at Concealment.Commands.RevealAll()
at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor)
at System.Reflection.RuntimeMethodInfo.UnsafeInvokeInternal(Object obj, Object[] parameters, Object[] arguments)
at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
at Torch.Commands.Command.TryInvoke(CommandContext context)
at Torch.Commands.CommandManager.HandleCommandFromServerInternal(String message, Action`1 subscriber)
at Essentials.AutoCommand.CommandStep.b__8_0()
at Sandbox.MySandboxGame.ProcessInvoke()
at Sandbox.MySandboxGame.Update()
at Sandbox.Engine.Platform.Game.UpdateInternal()
at Sandbox.Engine.Platform.Game.RunSingleFrame()
at Sandbox.Engine.Platform.FixedLoop.<>c__DisplayClass11_0.b__0()
at Sandbox.Engine.Platform.GenericLoop.Run(VoidAction tickCallback)
at Sandbox.Engine.Platform.Game.RunLoop()
at Sandbox.MySandboxGame.Run(Boolean customRenderLoop, Action disposeSplashScreen)
at Torch.VRageGame.DoStart()
at Torch.VRageGame.Run()
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.ThreadHelper.ThreadStart()

19:00:05.8546 [INFO] Torch.Commands.CommandManager: Server ran command '!reveal all'
19:00:14.8200 [INFO] Essentials: Deleting grid: 137589283351323824: Large Grid 3824