* @return The parsed {@code CSSStyleSheet} or an initialized but empty
* {@code CSSStyleSheetImpl} if the parsing was unsuccessful.
*/
private static CSSStyleSheet getStyleSheet(final File cssFile) {
CSSStyleSheet sheet = null;
final InputSource source = new InputSource(cssFile.toURI().toString());
try {
sheet = new CSSOMParser().parseStyleSheet(source, null, null);
} catch (final IOException e) {
LOG.error("IOException while reading {}", cssFile, e);