Made the connection string paramter required for thr bog stoage settings

Author: Joel Mitchell

src/Cofoundry.Plugins.Azure/AzureBlobFileService.cs

@@ -22,7 +22,9 @@ public class AzureBlobFileService : IFileStoreService
         private readonly CloudBlobClient _blobClient;
         private static ConcurrentDictionary<string, object> _initializedContainers = new ConcurrentDictionary<string, object>();
 
-        public AzureBlobFileService(AzureBlobFileServiceSettings settings)
+        public AzureBlobFileService(
+            AzureBlobFileServiceSettings settings
+            )
         {
             Condition.Requires(settings).IsNotNull();
 

src/Cofoundry.Plugins.Azure/AzureBlobFileServiceSettings.cs

@@ -4,6 +4,7 @@
 using System.Text;
 using System.Threading.Tasks;
 using Cofoundry.Core.Configuration;
+using System.ComponentModel.DataAnnotations;
 
 namespace Cofoundry.Plugins.Azure
 {
@@ -12,6 +13,7 @@ public class AzureBlobFileServiceSettings : PluginConfigurationSettingsBase
         /// <summary>
         /// The connection string to use when accessing files in blob storage
         /// </summary>
+        [Required]
         public string ConnectionString { get; set; }
     }
 }