Exception on Theme Change Without Open Project

[mattia72]

Describe the bug
Changing the theme when no project is open causes an exception:

[6068955D]{DRipExtensions.D12.dll} RipGrepper.UI.ParentFrame.TParentFrame.UpdateUIStyle + $6D
[60689553]{DRipExtensions.D12.dll} RipGrepper.UI.ParentFrame.TParentFrame.UpdateUIStyle + $63
[6066BD54]{DRipExtensions.D12.dll} DripExtension.UI.DockableForm.TRipGrepperDockableForm.ChangedTheme + $34
[6B539B9E]{coreide290.bpl} IDEServices.TIDEServices.NotifyIDEThemeChanged (Line 3216, "IDEServices.pas" + 1) + $15
[6D2602D4]{designide290.bpl} ToolUtils.ForEach (Line 117, "ToolUtils.pas" + 9) + $F
[6B539C67]{coreide290.bpl} IDEServices.TIDEServices.IDEThemeChanged (Line 3226, "IDEServices.pas" + 0) + $B
[6D23B0ED]{designide290.bpl} Events.TEvent.Send (Line 154, "Events.pas" + 2) + $11
[6A2FD6B8]{themeloader290.bpl} ThemeLoader.TIDEThemeManager.NotifyIDEThemeChanged (Line 384, "ThemeLoader.pas" + 1) + $9
[6A2FE08D]{themeloader290.bpl} ThemeLoader.TIDEThemeManager.DoSetIDETheme (Line 609, "ThemeLoader.pas" + 68) + $3
[00FFFFFB]{bds.exe     } PlatformDeviceSelectorCmdsToolbar.TPlatformDeviceCommandsToolbar.SetupFontAndSize + $EB
[6A2FDD36]{themeloader290.bpl} ThemeLoader.TIDEThemeManager.SetIDETheme (Line 531, "ThemeLoader.pas" + 0) + $2
[6A2FE3A7]{themeloader290.bpl} ThemeLoader.TIDEThemeManager.SetThemeClick (Line 680, "ThemeLoader.pas" + 15) + $6
[6C34394B]{rtl290.bpl  } System.Classes.TBasicAction.Execute (Line 18578, "System.Classes.pas" + 4) + $1
[6AB03742]{vcl290.bpl  } Vcl.ActnList.TCustomAction.Execute (Line 284, "Vcl.ActnList.pas" + 19) + $35
[6C3436FD]{rtl290.bpl  } System.Classes.TBasicActionLink.Execute (Line 18472, "System.Classes.pas" + 8) + $B
[6AC4DC7B]{vcl290.bpl  } Vcl.Menus.TMenuItem.Click (Line 2627, "Vcl.Menus.pas" + 17) + $7
[6AC4F44B]{vcl290.bpl  } Vcl.Menus.TMenu.DispatchCommand (Line 3586, "Vcl.Menus.pas" + 5) + $2
[6AC506C6]{vcl290.bpl  } Vcl.Menus.TPopupList.WndProc (Line 4759, "Vcl.Menus.pas" + 4) + $E
(00080B23){CnWizards_D120A1.DLL} [61A81B23]
[6AC50615]{vcl290.bpl  } Vcl.Menus.TPopupList.MainWndProc (Line 4734, "Vcl.Menus.pas" + 2) + $5
[6C34477C]{rtl290.bpl  } System.Classes.StdWndProc (Line 19085, "System.Classes.pas" + 9) + $2
[6C224A64]{rtl290.bpl  } System.@FinalizeRecord (Line 33281, "System.pas" + 81) + $2
[6AC73927]{vcl290.bpl  } Vcl.Forms.TApplication.ProcessMessage (Line 13282, "Vcl.Forms.pas" + 23) + $1
[6AC7396A]{vcl290.bpl  } Vcl.Forms.TApplication.HandleMessage (Line 13312, "Vcl.Forms.pas" + 1) + $4
[6AC73CA9]{vcl290.bpl  } Vcl.Forms.TApplication.Run (Line 13451, "Vcl.Forms.pas" + 27) + $3
[01068AD2]{bds.exe     } bds.bds + $DE

If the user opens a project after the exception, everything works correctly.