remove more invalid fonts

lib/single-file/modules/css-fonts-alt-minifier.js

@@ -227,6 +227,8 @@ this.singlefile.lib.modules.fontsAltMinifier = this.singlefile.lib.modules.fonts
 				const otfFontFound = findSource("opentype") || findSource("embedded-opentype");
 				if (otfFontFound) {
 					fontInfo = filterSource(otfFontFound);
+				} else {
+					fontInfo = fontInfo.filter(source => !source.src.match(EMPTY_URL_SOURCE) && (source.valid) || source.src.startsWith(LOCAL_SOURCE));
 				}
 			}
 		}