NoMethodError: undefined method `start_with?' for nil:NilClass

[apuntamb]

In file compute.rb, vm_hash[:vhd_path] parameter is unable to fetch the image_id for the given image. This in turn, fails with the specified error NoMethodError: undefined method 'start_with?' for nil:NilClass`.

[apuntamb]

As per recent findings, if Compute Profile field on Host tab, is selected before, the Image field on Operating System tab loads an image name and becomes a non-editable field. Therefore, the request does not send the image_id parameter and is retrieved as Nil.
But, if I do not select Compute Profile prior to selecting the arch & os on OS tab, the Image field shows a drop-down with the associated images and I can get the image_id value. So, I am unable to understand if this is the expected workflow or a bug.
Any pointers?