empty Do block check

Author: danielgerlag

src/WorkflowCore/Services/FluentBuilders/ParallelStepBuilder.cs

@@ -25,8 +25,12 @@ public ParallelStepBuilder(IWorkflowBuilder<TData> workflowBuilder, IStepBuilder
 
         public IParallelStepBuilder<TData, TStepBody> Do(Action<IWorkflowBuilder<TData>> builder)
         {
-            int lastStep = WorkflowBuilder.LastStep;
-            builder.Invoke(WorkflowBuilder);            
+            var lastStep = WorkflowBuilder.LastStep;
+            builder.Invoke(WorkflowBuilder);
+            
+            if (lastStep == WorkflowBuilder.LastStep)
+                throw new NotSupportedException("Empty Do block not supported");
+            
             Step.Children.Add(lastStep + 1); //TODO: make more elegant
 
             return this;

src/WorkflowCore/WorkflowCore.csproj

@@ -2,7 +2,6 @@
 
   <PropertyGroup>
     <AssemblyTitle>Workflow Core</AssemblyTitle>
-    <VersionPrefix>1.4.0</VersionPrefix>
     <Authors>Daniel Gerlag</Authors>
     <TargetFramework>netstandard1.3</TargetFramework>
     <AssemblyName>WorkflowCore</AssemblyName>
@@ -16,9 +15,9 @@
     <GenerateAssemblyCompanyAttribute>false</GenerateAssemblyCompanyAttribute>
     <GenerateAssemblyProductAttribute>false</GenerateAssemblyProductAttribute>
     <Description>Workflow Core is a light weight workflow engine targeting .NET Standard.</Description>
-    <Version>1.6.1</Version>
-    <AssemblyVersion>1.6.1.0</AssemblyVersion>
-    <FileVersion>1.6.1.0</FileVersion>
+    <Version>1.6.2</Version>
+    <AssemblyVersion>1.6.2.0</AssemblyVersion>
+    <FileVersion>1.6.2.0</FileVersion>
     <PackageReleaseNotes></PackageReleaseNotes>
   </PropertyGroup>