Make a new Segmentation in Lead Database that splits up your database into "People with a name" and "People without a name".
Then you can use dynamic content in your email (or landing page) using your new segmentation. For the People with a name segment, enter in what you have above - and for the People without a name" segment, leave it blank.
In creating a segmentation for salutation, what happens if a further segmentation for, say, industry is required? Is it necessary to create segments per industry/name combination or can segments somehow be combined when creating the email?