Disallow empty rules - dashk/csslint GitHub Wiki
An empty rule is one that doesn't contain any properties, such as:
.foo {
}
A lot of times, empty rules appear as a result of refactoring without further cleanup. Eliminating empty rules results in smaller file sizes and less style information for the browser to deal with.
Rule Details
Rule ID: empty-rules
This rule warns when an empty rule is found in the CSS. The following patterns are considered warnings:
.mybox { }
.mybox {
}
.mybox {
/* a comment */
}