By accident I terminated a background color attribute with not one but two semicolons, and the parser was kind enough to log this error:

WARNING: com.sun.javafx.css.parser.CSSParser parse Expected RBRACE at file:/Users/randahl/Dropbox/Development/wefend/ui/target/classes/styling/wefend.fhd.css[35,5]

That is all fine and helpful, however what surprised me was that this single semicolon completely trashed my whole UI - the whole app was styled in a weird looking way I have never seen before. So, I am filing this to inform you that the current parser implementation really crashes completely over empty statements. Perhaps you would want to improve that, so that the parser just ignores them after logging the warning above.

Here is the code that made the parser go crazy:

.tool-button {
    -fx-background-insets: 0, 1;
    -fx-background-radius: 36, 35;
    -fx-padding: 0 0 0 0;
    -fx-alignment: CENTER;
    -fx-graphic-vpos: CENTER;
-fx-background-color: linear-gradient(
to bottom,
rgb(170, 167, 152) 0%,
rgb(207, 202, 195) 50%,
rgb(251, 245, 223) 75%,
rgb(255, 255, 255) 100%
);; /* TWO SEMICOLONS HERE */
}