The artefact vertex has no producer vertex set exception. When folder artefact status requested as file artefact status

[dgrechka]

imageSummaryAnalysis is actually a directory and needs to be specifed with trailing /, but with shell autocomplete does not place trainling /.

thus
alpheus status imageSummaryAnalysis
results in

System.InvalidOperationException: The artefact vertex has no producer vertex set. Set the ProduceBy before retrieving its value
   at ItisLab.Alpheus.DependencyGraph.ArtefactVertex.get_ProducedBy() in /drone/src/AlpheusCore/DependencyGraph.fs:line 135
   at ItisLab.Alpheus.DependencyGraphToAngaraWrapper.ItisLab-Alpheus-AngaraTranslator-IDependencyGraph`2-ProducedBy(ArtefactVertex artefact) in /drone/src/AlpheusCore/DependencyGraphToAngaraWrapper.fs:line 19
   at ItisLab.Alpheus.AngaraTranslator.registerArtefactRelatedMethods@31[Node,Artefact,Method](FSharpFunc`2 nodeFactory, IDependencyGraph`2 dependencyGraph, Artefact artefact, FlowGraph`1 graph, FSharpMap`2 methodNodeMap) in /drone/src/AlpheusCore/AngaraTranslator.fs:line 34
   at ItisLab.Alpheus.AngaraTranslator.registerArtefact@61.Invoke(Tuple`2 tupledArg, Artefact artefact) in /drone/src/AlpheusCore/AngaraTranslator.fs:line 61
   at Microsoft.FSharp.Collections.SeqModule.Fold[T,TState](FSharpFunc`2 folder, TState state, IEnumerable`1 source) in F:\workspace\_work\1\s\src\fsharp\FSharp.Core\seq.fs:line 731
   at ItisLab.Alpheus.AngaraTranslator.translate[Node,Artefact,Method](FSharpFunc`2 nodeFactory, IDependencyGraph`2 dependencyGraph) in /drone/src/AlpheusCore/AngaraTranslator.fs:line 63
   at ItisLab.Alpheus.StatusGraph.buildStatusGraph(Graph g, String experimetRoot, FSharpFunc`2 checkStoragePresence) in /drone/src/AlpheusCore/StatusGraph.fs:line 114
   at ItisLab.Alpheus.API.status@170-1.Invoke(Graph _arg1) in /drone/src/AlpheusCore/API.fs:line 170
   at Microsoft.FSharp.Control.AsyncPrimitives.CallThenInvokeNoHijackCheck[a,b](AsyncActivation`1 ctxt, FSharpFunc`2 userCode, b result1) in F:\workspace\_work\1\s\src\fsharp\FSharp.Core\async.fs:line 417
   at ItisLab.Alpheus.API.buildDependencyGraphAsync@22-3.Invoke(AsyncActivation`1 ctxt) in /drone/src/AlpheusCore/API.fs:line 22
   at Microsoft.FSharp.Control.Trampoline.Execute(FSharpFunc`2 firstAction) in F:\workspace\_work\1\s\src\fsharp\FSharp.Core\async.fs:line 109
--- End of stack trace from previous location where exception was thrown ---
   at Microsoft.FSharp.Control.AsyncResult`1.Commit() in F:\workspace\_work\1\s\src\fsharp\FSharp.Core\async.fs:line 350
   at Microsoft.FSharp.Control.AsyncPrimitives.RunSynchronouslyInCurrentThread[a](CancellationToken cancellationToken, FSharpAsync`1 computation) in F:\workspace\_work\1\s\src\fsharp\FSharp.Core\async.fs:line 882
   at Microsoft.FSharp.Control.AsyncPrimitives.RunSynchronously[T](CancellationToken cancellationToken, FSharpAsync`1 computation, FSharpOption`1 timeout) in F:\workspace\_work\1\s\src\fsharp\FSharp.Core\async.fs:line 890
   at Microsoft.FSharp.Control.FSharpAsync.RunSynchronously[T](FSharpAsync`1 computation, FSharpOption`1 timeout, FSharpOption`1 cancellationToken) in F:\workspace\_work\1\s\src\fsharp\FSharp.Core\async.fs:line 1154
   at ItisLab.Alpheus.CliRunner.run@73-22.Invoke(Tuple`2 _arg9) in /drone/src/Alpheus.CLI/Runner.fs:line 73
   at Microsoft.FSharp.Core.ResultModule.Bind[T,TResult,TError](FSharpFunc`2 binder, FSharpResult`2 result) in F:\workspace\_work\1\s\src\fsharp\FSharp.Core\result.fs:line 15
   at ItisLab.Alpheus.CliRunner.run$cont@61-1(String workingDir, ParseResults`1 parseResults, String usage, Unit unitVar) in /drone/src/Alpheus.CLI/Runner.fs:line 72
   at ItisLab.Alpheus.Program.main(String[] argv) in /drone/src/Alpheus.CLI/Program.fs:line 42