Replace return with exception

Author: Filipe GOMES PEIXOTO

src/EntityFrameworkCore.DataEncryption/ModelBuilderExtensions.cs

@@ -1,6 +1,7 @@
 using System;
 using Microsoft.EntityFrameworkCore.DataEncryption.Internal;
 using Microsoft.EntityFrameworkCore.Metadata;
+using System;
 using System.ComponentModel.DataAnnotations;
 using System.Linq;
 
@@ -20,7 +21,7 @@ public static void UseEncryption(this ModelBuilder modelBuilder, IEncryptionProv
         {
             if (encryptionProvider == null)
             {
-                return;
+                throw new ArgumentNullException(nameof(encryptionProvider), "Cannot initialize encryption with a null provider.");
             }
 
             var encryptionConverter = new EncryptionConverter(encryptionProvider);

test/EntityFrameworkCore.DataEncryption.Test/Context/DatabaseContext.cs

@@ -18,6 +18,8 @@ public DatabaseContext(DbContextOptions options, IEncryptionProvider encryptionP
             _encryptionProvider = encryptionProvider;
         }
         protected override void OnModelCreating(ModelBuilder modelBuilder)
-            => modelBuilder.UseEncryption(_encryptionProvider);
+        {
+            modelBuilder.UseEncryption(_encryptionProvider);
+        }
     }
 }