Fixed bug where single select multiple choice survey questions that are required leave the form permanently disabled.

awx/ui/client/src/shared/directives.js

@@ -1390,7 +1390,7 @@ function(ConfigurationUtils, i18n, $rootScope) {
                             }
                         }
                         else {
-                            return false;
+                            return (!value || value === "") ? false : true;
                         }
                     };
                 }