See the following excerpt from an article posted over on the main site by Pete Vilmur:
"For a sequence from the film that was immediately lauded as an audience favorite, it's a bit strange that not a single photograph of the cantina, or any of its colorful customers, were highlighted in the US media kits or published products available in 1977. In fact, the cantina didn't make an appearance in Topps' classic trading card set until the fifth series -- card # 277 -- released well into 1978.
Further evidence of a cantina cover-up arrived in the form of Ballantine's 1978 Star Wars Album book, a revised reprint of an earlier 1977 international collector's magazine. While the overall imagery and text remained the same, there were a few noteworthy omissions: a photo of the human actor portraying Jabba the Hutt in a deleted scene was removed; passages describing locales scripted for the sequel were stripped out; and most tellingly, a full-page color illustration of cantina aliens by the Hildebrandt Brothers had gone missing along with the artists' bio."