Add alert dialogs for import error/success

options.html

@@ -263,6 +263,12 @@
 			<div id="alertNoImportFile" title="LeechBlock Options">
 				<p>Please select a file containing the options to import.</p>
 			</div>
+			<div id="alertImportError" title="LeechBlock Options">
+				<p><strong>Error:</strong> Unable to import options from file.</p>
+			</div>
+			<div id="alertImportSuccess" title="LeechBlock Options">
+				<p>The options have been imported successfully.</p>
+			</div>
 			<div id="alertLockdownCancel" title="LeechBlock Options">
 				<p>The active lockdown has been canceled.</p>
 			</div>

options.js

@@ -434,7 +434,7 @@ function importOptions() {
 	function processImportFile(event) {
 		let text = event.target.result;
 		if (!text) {
-			warn("Cannot import options from file.");
+			$("#alertImportError").dialog("open");
 			return;
 		}
 
@@ -444,13 +444,20 @@ function importOptions() {
 		let regexp = /^(\w+)=(.*)$/;
 		let lines = text.split(/[\n\r]+/);
 		let options = {};
+		let hasOptions = false;
 		for (let line of lines) {
 			let results = regexp.exec(line);
 			if (results) {
 				options[results[1]] = results[2];
+				hasOptions = true;
 			}
 		}
 
+		if (!hasOptions) {
+			$("#alertImportError").dialog("open");
+			return;
+		}
+
 		for (let set = 1; set <= NUM_SETS; set++) {
 			// Get option values
 			let setName = options[`setName${set}`];
@@ -610,6 +617,8 @@ function importOptions() {
 		if (contextMenu != undefined) {
 			getElement("contextMenu").checked = contextMenu;
 		}
+
+		$("#alertImportSuccess").dialog("open");
 	}
 }