bugfix (Azure#15352)

Author: VeryEarly

src/AlertsManagement/AlertsManagement.sln

@@ -1,6 +1,6 @@
 Microsoft Visual Studio Solution File, Format Version 12.00
-# Visual Studio 15
-VisualStudioVersion = 15.0.27703.2042
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.31327.141
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "AlertsManagement", "AlertsManagement\AlertsManagement.csproj", "{42656543-77AD-4968-BA4B-BE0778705625}"
 EndProject
@@ -38,6 +38,10 @@ Global
 		{142D7B0B-388A-4CEB-A228-7F6D423C5C2E}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{142D7B0B-388A-4CEB-A228-7F6D423C5C2E}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{142D7B0B-388A-4CEB-A228-7F6D423C5C2E}.Release|Any CPU.Build.0 = Release|Any CPU
+		{6BD6B80A-06AF-4B5B-9230-69CCFC6C8D64}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{6BD6B80A-06AF-4B5B-9230-69CCFC6C8D64}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{6BD6B80A-06AF-4B5B-9230-69CCFC6C8D64}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{6BD6B80A-06AF-4B5B-9230-69CCFC6C8D64}.Release|Any CPU.Build.0 = Release|Any CPU
 		{FF81DC73-B8EC-4082-8841-4FBF2B16E7CE}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
 		{FF81DC73-B8EC-4082-8841-4FBF2B16E7CE}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{FF81DC73-B8EC-4082-8841-4FBF2B16E7CE}.Release|Any CPU.ActiveCfg = Release|Any CPU

src/AlertsManagement/AlertsManagement/ActionRuleCommands/SetAzureActionRule.cs

@@ -335,7 +335,7 @@ protected override void ProcessRecordInternal()
                                 endTime: SuppressionEndTime.Split(' ')[1]
                                 );
 
-                            if (ReccurentValue.Length > 0)
+                            if (ReccurentValue?.Length > 0)
                             {
                                 config.Schedule.RecurrenceValues = ReccurentValue.OfType<int?>().ToList();
                             }

src/AlertsManagement/AlertsManagement/ChangeLog.md

@@ -18,6 +18,7 @@
         - Additional information about change #1
 -->
 ## Upcoming Release
+* Fixed bug for `Set-AzActionRule` when RecurrenceType is "Once" and no "ReccurentValue" provided [#14476]
 
 ## Version 0.2.0
 * Fixed bug for `Set-AzActionRule` incorrectly parsed `TargetResourceTypeCondition` to `MonitorCondition` [#12258]