Bug Fix for Update-AzCapacityReservationGroup (#24703)

* bug fix

* changelog

Author: haagha

src/Compute/Compute/ChangeLog.md

@@ -21,6 +21,7 @@
 -->
 ## Upcoming Release
 * Added cmdlet `Invoke-AzSpotPlacementRecommender`.
+* Fixed `Update-AzCapacityReservationGroup` to remove Subscriptions from SharingProfile.
 
 ## Version 7.2.0
 * Added parameters `-scriptUriManagedIdentity`, `-outputBlobManagedIdentity`, `-errorBlobMangedIdentity`, and `-TreatFailureAsDeploymentFailure` to cmdlets `Set-AzVmRunCommand` and `Set-AzVmssRunCommand`. 

src/Compute/Compute/Generated/CapacityReservation/UpdateAzCapacityReservationGroupCommand.cs

@@ -131,7 +131,10 @@ public override void ExecuteCmdlet()
                         {
                             resourceSharingProfile.SubscriptionIds = new List<SubResource>();
                         }
-                        resourceSharingProfile.SubscriptionIds.Add(subResource);
+                        if (!string.IsNullOrEmpty(item))
+                        { 
+                            resourceSharingProfile.SubscriptionIds.Add(subResource);
+                        }
                     }
                     capacityReservationGroupUpdate.SharingProfile = resourceSharingProfile;
                 }