flex slider with unique links and no links
To do that you can simply:


Add new text field to your content type and name it Link for example.
Add this field into your view, hide it by check 'Exclude from display' in views field settings and move it above your banner image field.
Open views settings for the banner image field, under 'Rewrite results
' section check 'Output this field as a link' and put replacement pattern for your link text field in 'Link path' input, e.g. [field_link].
Save your view and now each banner is linked to any path you specify in the Link text field or is not if you leave this field empty.