Update PictureService.cs - NullReferenceException remedy #7480
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This is an edge case - my plugin generates invoices in a background task, in which the HttpContext in null, which produces `System.NullReferenceException: Object reference not set to an instance of an object.` `HttpContext` should have a null check just like `Request` does and this should not have any negative side effects, since null is just converted to `string.Empty` anyway.
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This is an edge case - my plugin generates invoices in a background task, in which the HttpContext is null, which produces
System.NullReferenceException: Object reference not set to an instance of an object.HttpContextshould have a null check just likeRequestdoes and this should not have any negative side effects, since null is just converted tostring.Emptyanyway.