[Issue] Troubleshoot-ModernSearch error in Get-IndexStateOfMessage

System.Management.Automation.RuntimeException: You cannot call a method on a null-valued expression.
   at System.Management.Automation.ExceptionHandlingOps.CheckActionPreference(FunctionContext funcContext, Exception exception)
   at System.Management.Automation.Interpreter.ActionCallInstruction`2.Run(InterpretedFrame frame)
   at System.Management.Automation.Interpreter.EnterTryCatchFinallyInstruction.Run(InterpretedFrame frame)
   at System.Management.Automation.Interpreter.EnterTryCatchFinallyInstruction.Run(InterpretedFrame frame)
   at System.Management.Automation.Interpreter.Interpreter.Run(InterpretedFrame frame)
   at System.Management.Automation.Interpreter.LightLambda.RunVoid1[T0](T0 arg0)
   at System.Management.Automation.PSScriptCmdlet.RunClause(Action`1 clause, Object dollarUnderbar, Object inputToProcess)
   at System.Management.Automation.PSScriptCmdlet.DoProcessRecord()
   at System.Management.Automation.CommandProcessor.ProcessRecord()
at Get-IndexStateOfMessage<Process>, C:\distr\Troubleshoot-ModernSearch.ps1: line 398
at Get-MessageInformationObject<Begin>, C:\distr\Troubleshoot-ModernSearch.ps1: line 441
at Get-MessageIndexState<Process>, C:\distr\Troubleshoot-ModernSearch.ps1: line 598
at Main, C:\distr\Troubleshoot-ModernSearch.ps1: line 1697
at <ScriptBlock>, C:\distr\Troubleshoot-ModernSearch.ps1: line 1760
at <ScriptBlock>, <No file>: line 1

Get-IndexStateOfMessage probably needs a null check before calling ToString() here: