Fixed bug in options page with undefined pattern lists

options.js

 
 function resetChanges() {
 	chrome.storage.sync.get([ "matchingPatterns", "exclusionPatterns", "mode" ], (result) => {
-		document.querySelector("#matchingPatterns textarea").value = result.matchingPatterns;
-		document.querySelector("#exclusionPatterns textarea").value = result.exclusionPatterns;
+		document.querySelector("#matchingPatterns textarea").value = result.matchingPatterns || "";
+		document.querySelector("#exclusionPatterns textarea").value = result.exclusionPatterns || "";
 		window.currentMode = result.mode || "blacklist";
 
 		toggleModeSelectorState(window.currentMode);