[migration/3.18] protect against attributes in db missing from fsschema
Happens if a previous migration forgot a drop_attribute.
Closes #3471609
* {
color: #000 !important;
}
div#popupLoginBox,
div#popupLoginBox,
img#logo, div.header,
#navColumnLeft, #navColumnRight,
#footer {
display: none
}
div#pageContent{
border: none;
}