[Synapse]fix remove artifact throw exception ArgumentNullException (#28123)

Co-authored-by: Copilot <[email protected]>

Author: kevinzz6

src/Synapse/Synapse/ChangeLog.md

@@ -19,7 +19,7 @@
 -->
 
 ## Upcoming Release
-
+* Fixed an error when remove artifact throw `ArgumentNullException`
 ## Version 3.2.1
 * Fixed an error of not correctly setting the cmdlet context
 

src/Synapse/Synapse/Common/Utils.cs

@@ -239,10 +239,14 @@ public static Response Poll(this Operation operation)
         {
             var result = operation.WaitForCompletionResponseAsync().Result;
             var responseContent = result.Content;
-            
-            if (responseContent?.ToString() != "{}" && responseContent?.ToString().IsEmptyOrWhiteSpace() == false)
-            {
 
+            //Fix when responseContent.length is 0 responseContent?.ToString() will throw exception ArgumentNullException 
+            if (result.ContentStream == null || result.ContentStream.Length == 0)
+            {
+                return result;
+            }
+            else if (responseContent?.ToString() != "{}" && responseContent?.ToString().IsEmptyOrWhiteSpace() == false)
+            {
                 throw new Exception(responseContent?.ToString());
             }
             return result;