Adds guard against empty search strings to Find in Article

iOS/Article/WebViewController.swift

@@ -709,6 +709,7 @@ internal struct FindInArticleState: Codable {
 }
 
 extension WebViewController {
+	
 	func searchText(_ searchText: String, completionHandler: @escaping (FindInArticleState) -> Void) {
 		guard let json = try? JSONEncoder().encode(FindInArticleOptions(text: searchText)) else {
 			return

iOS/Resources/main_ios.js

@@ -429,6 +429,11 @@ updateFind = withEncodedArg(options => {
 	// TODO Introduce slight delay, cap the number of results, and report results asynchronously
 	
 	let newFindState;
+	if (!options || !options.text) {
+		clearHighlightRects();
+		return
+	}
+	
 	try {
 		newFindState = new FindState(options);
 	} catch (err) {