fixed testing of not empty URLs

lib/single-file/single-file-core.js

@@ -1103,21 +1103,17 @@ this.SingleFileCore = this.SingleFileCore || (() => {
 					if (DomUtil.testValidPath(resourceURL, baseURI)) {
 						resourceURL = new URL(resourceURL, baseURI).href;
 						if (DomUtil.testValidURL(resourceURL, baseURI)) {
-							try {
-								const { content, indexResource, duplicate } = await batchRequest.addURL(resourceURL);
-								if (removeElementIfMissing && content == EMPTY_DATA_URI) {
-									resourceElement.remove();
-								} else {
-									if (content.startsWith(prefixDataURI) || content.startsWith(PREFIX_DATA_URI_NO_MIMETYPE) || content.startsWith(PREFIX_DATA_URI_OCTET_STREAM)) {
-										if (processDuplicates && duplicate && options.groupDuplicateImages && !content.startsWith(PREFIX_DATA_URI_IMAGE_SVG) && DomUtil.replaceImageSource(resourceElement, SINGLE_FILE_VARIABLE_NAME_PREFIX + indexResource, options)) {
-											DomUtil.insertVariable(doc, indexResource, content, options);
-										} else {
-											resourceElement.setAttribute(attributeName, content);
-										}
+							const { content, indexResource, duplicate } = await batchRequest.addURL(resourceURL);
+							if (removeElementIfMissing && content == EMPTY_DATA_URI) {
+								resourceElement.remove();
+							} else {
+								if (content.startsWith(prefixDataURI) || content.startsWith(PREFIX_DATA_URI_NO_MIMETYPE) || content.startsWith(PREFIX_DATA_URI_OCTET_STREAM)) {
+									if (processDuplicates && duplicate && options.groupDuplicateImages && !content.startsWith(PREFIX_DATA_URI_IMAGE_SVG) && DomUtil.replaceImageSource(resourceElement, SINGLE_FILE_VARIABLE_NAME_PREFIX + indexResource, options)) {
+										DomUtil.insertVariable(doc, indexResource, content, options);
+									} else {
+										resourceElement.setAttribute(attributeName, content);
 									}
 								}
-							} catch (error) {
-								/* ignored */
 							}
 						}
 					}
@@ -1197,7 +1193,7 @@ this.SingleFileCore = this.SingleFileCore || (() => {
 	const FILE_URI_PREFIX = /^file:\/\//;
 	const EMPTY_URL = /^https?:\/\/+\s*$/;
 	const ABOUT_BLANK_URI = "about:blank";
-	const NOT_EMPTY_URL = /^(https|file)?:\/\/.+/;
+	const NOT_EMPTY_URL = /^(https?|file):\/\/.+/;
 	const REGEXP_URL_FN = /(url\s*\(\s*'(.*?)'\s*\))|(url\s*\(\s*"(.*?)"\s*\))|(url\s*\(\s*(.*?)\s*\))/gi;
 	const REGEXP_URL_SIMPLE_QUOTES_FN = /^url\s*\(\s*'(.*?)'\s*\)$/i;
 	const REGEXP_URL_DOUBLE_QUOTES_FN = /^url\s*\(\s*"(.*?)"\s*\)$/i;