Throw exception if provder was not found

modules/setting-management/src/Volo.Abp.SettingManagement.Domain/Volo/Abp/SettingManagement/SettingManager.cs

@@ -125,7 +125,7 @@ public class SettingManager : ISettingManager, ISingletonDependency
 
         if (!providers.Any())
         {
-            return;
+            throw new AbpException($"Could not find a setting provider named '{providerName}'.");
         }
 
         if (setting.IsEncrypted)

modules/setting-management/test/Volo.Abp.SettingManagement.Tests/Volo/Abp/SettingManagement/SettingManager_Basic_Tests.cs

@@ -63,4 +63,15 @@ public class SettingManager_Basic_Tests : SettingsTestBase
         (await _settingManager.GetOrNullGlobalAsync("MySetting1")).ShouldBe("43");
         (await _settingProvider.GetOrNullAsync("MySetting1")).ShouldBe("43");
     }
+    
+    [Fact]
+    public async Task Should_Throw_Exception_If_Provider_Not_Found()
+    {
+        var exception = await Assert.ThrowsAsync<AbpException>(async () =>
+        {
+            await _settingManager.SetAsync("MySetting1", "43", "UndefinedProvider", "UndefinedProviderKey");
+        });
+        
+        exception.Message.ShouldBe("Could not find a setting provider named 'UndefinedProvider'.");
+    }
 }