[Refactoring] ImageBoundingBox in BarcodeResult may lead to NRE

[thomasgalliker]

Description

ImageBoundingBox in BarcodeResult is used in Equals and this could lead to a NullReferenceException. Avoid it and write a test for it.

References

CameraScanner.Maui/CameraScanner.Maui/BarcodeResult.cs

Line 34 in 8ed8c0e

if (this.RawValue == other.RawValue && this.ImageBoundingBox.IntersectsWith(other.ImageBoundingBox))