Fixed SPE-1192

Wrong list of SLA-materials, when no SLA-printer is installed, but 3MF with SLA print is loaded

src/libslic3r/Preset.cpp

@@ -412,6 +412,8 @@ void Preset::set_visible_from_appconfig(const AppConfig &app_config)
 	    	for (auto it = this->renamed_from.begin(); ! is_visible && it != this->renamed_from.end(); ++ it)
 	    		is_visible = has(*it);
 	    }
+        else 
+			is_visible = false;
     }
 }