Merge pull request Azure#10580 from VeryEarly/nullreferenceexception-in-GetAzLocation#10575

handle null reference in get-azlocation when no subscription under current directory

Author: isra-fel

src/Resources/ResourceManager/Implementation/Locations/GetAzureLocationCmdlet.cs

@@ -22,6 +22,7 @@ namespace Microsoft.Azure.Commands.ResourceManager.Cmdlets.Implementation
     using System.Collections.Generic;
     using System.Linq;
     using System.Management.Automation;
+    using Microsoft.Azure.Commands.ResourceManager.Cmdlets.Properties;
 
     /// <summary>
     /// Get all locations with the supported providers.
@@ -34,6 +35,10 @@ public class GetAzureLocationCmdlet : ResourceManagerCmdletBase
         /// </summary>
         public override void ExecuteCmdlet()
         {
+            if(DefaultContext.Subscription == null)
+            {
+                throw new PSInvalidOperationException(Resources.NoSubscriptionsUnderCurrentDirectory);
+            }
             var allLocations = this.SubscriptionSdkClient.ListLocations(DefaultContext.Subscription.Id.ToString());
             var providers = this.ResourceManagerSdkClient.ListResourceProviders(providerName: null, listAvailable: true);
             var providerLocations = ConstructResourceProviderLocations(allLocations, providers);

src/Resources/ResourceManager/Properties/Resources.Designer.cs

@@ -423,4 +423,7 @@
   <data name="InvalidFilePath" xml:space="preserve">
     <value>The provided file {0} doesn't exist</value>
   </data>
-</root>
+  <data name="NoSubscriptionsUnderCurrentDirectory" xml:space="preserve">
+    <value>No subscriptions can be found under current directory. Please login again using Connect-AzAccount.</value>
+  </data>
+</root>