So you want to be able to set a differnt style to cells that are empty.
You can do something like:
In the view:
<td<%= ' class="empty"' if(list.commm.blank?) %>>
<%=h list.comm %>
</td>
In the css:
.list-line-even.empty, .list-line-even1.empty {
color: #F00;
}
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