Exception after canceling creation of a new Recurring Transactions

[TheAxelander]

Describe the bug An exception occurs after canceling creation of a new Recurring Transactions

To Reproduce Steps to reproduce the behavior:

1. Go to Transaction Page
2. Click on 'Manage' of 'Add Recurring Transaction'
3. Click on 'Create Transaction'
4. Click on Cancel Button
5. See error

Expected behavior No exception occurs

Additional helpful details Exception according to Docker logs:

Unhandled exception rendering component: Object reference not set to an instance of an object.
      System.NullReferenceException: Object reference not set to an instance of an object.
         at OpenBudgeteer.Core.ViewModels.EntityViewModels.RecurringTransactionViewModel.CancelModification() in /src/OpenBudgeteer.Core/ViewModels/EntityViewModels/RecurringTransactionViewModel.cs:line 405
         at OpenBudgeteer.Blazor.Shared.RecurringTransactionDialog.<>c__DisplayClass0_0.<BuildRenderTree>b__9() in /src/OpenBudgeteer.Blazor/Shared/RecurringTransactionDialog.razor:line 79
         at Microsoft.AspNetCore.Components.EventCallbackWorkItem.InvokeAsync[T](MulticastDelegate delegate, T arg)
         at Microsoft.AspNetCore.Components.ComponentBase.Microsoft.AspNetCore.Components.IHandleEvent.HandleEventAsync(EventCallbackWorkItem callback, Object arg)
         at Microsoft.AspNetCore.Components.RenderTree.Renderer.DispatchEventAsync(UInt64 eventHandlerId, EventFieldInfo fieldInfo, EventArgs eventArgs, Boolean waitForQuiescence)
fail: Microsoft.AspNetCore.Components.Server.Circuits.CircuitHost[111]
      Unhandled exception in circuit 'DGURh76THEDcd18xOCJjjMG6YiggujOFzVJTaL7UB2I'.
      System.NullReferenceException: Object reference not set to an instance of an object.
         at OpenBudgeteer.Core.ViewModels.EntityViewModels.RecurringTransactionViewModel.CancelModification() in /src/OpenBudgeteer.Core/ViewModels/EntityViewModels/RecurringTransactionViewModel.cs:line 405
         at OpenBudgeteer.Blazor.Shared.RecurringTransactionDialog.<>c__DisplayClass0_0.<BuildRenderTree>b__9() in /src/OpenBudgeteer.Blazor/Shared/RecurringTransactionDialog.razor:line 79
         at Microsoft.AspNetCore.Components.EventCallbackWorkItem.InvokeAsync[T](MulticastDelegate delegate, T arg)
         at Microsoft.AspNetCore.Components.ComponentBase.Microsoft.AspNetCore.Components.IHandleEvent.HandleEventAsync(EventCallbackWorkItem callback, Object arg)
         at Microsoft.AspNetCore.Components.RenderTree.Renderer.DispatchEventAsync(UInt64 eventHandlerId, EventFieldInfo fieldInfo, EventArgs eventArgs, Boolean waitForQuiescence)

[TheAxelander]

Confirmed existence in version 1.7.1