Fixed usage of WorkflowStep.Name when it could be null in WorkflowActivity.

Author: jakenuts

src/Directory.Build.props

@@ -4,10 +4,10 @@
     <PackageLicenseUrl>https://github.com/danielgerlag/workflow-core/blob/master/LICENSE.md</PackageLicenseUrl>
     <RepositoryType>git</RepositoryType>
     <RepositoryUrl>https://github.com/danielgerlag/workflow-core.git</RepositoryUrl>
-    <Version>3.9.0</Version>
-    <AssemblyVersion>3.9.0.0</AssemblyVersion>
-    <FileVersion>3.9.0.0</FileVersion>
+    <Version>3.9.1</Version>
+    <AssemblyVersion>3.9.1.0</AssemblyVersion>
+    <FileVersion>3.9.1.0</FileVersion>
     <PackageIconUrl>https://github.com/danielgerlag/workflow-core/raw/master/src/logo.png</PackageIconUrl>
-    <PackageVersion>3.9.0</PackageVersion>
+    <PackageVersion>3.9.1</PackageVersion>
   </PropertyGroup>
 </Project>

src/WorkflowCore/Services/WorkflowActivity.cs

@@ -59,7 +59,7 @@ internal static void Enrich(WorkflowStep workflowStep)
 
                 activity.DisplayName += $" step {stepName}";
                 activity.SetTag("workflow.step.id", workflowStep.Id);
-                activity.SetTag("workflow.step.name", workflowStep.Name);
+                activity.SetTag("workflow.step.name", stepName);
                 activity.SetTag("workflow.step.type", workflowStep.BodyType.Name);
             }
         }