[sonic-yang] Backlinks are none when there is 0 backlinks #7939
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Why I did it
Backlinks are none when there is 0 backlinks. without this change
backlinks.number()throws an exception when backlinks==None.How I did it
Allow backlinks to be None, so we get an empty list as a return from find_data_dependencies
How to verify it
Which release branch to backport (provide reason below if selected)