JavaScript: Improve control flow of development mode function

public/js/app.js

@@ -241,7 +241,12 @@ $(document).ready(function() {
 		$.get('/admin/toggle-development-mode').done(function(data)
 		{
 			const response = JSON.parse(data);
-			if (response.success == true) {
+			if (response.success == false) {
+				console.log(data);
+				alert("Development mode could not be enabled!");
+				return;
+			}
+
 			if (response.result.value == 'on') {
 				e.target.checked = true;
 				$('#develop-enabled').css('visibility', 'visible');
@@ -253,11 +258,6 @@ $(document).ready(function() {
 			}
 
 			alert("Development mode has been set to: '" + response.result.value + "'");
-			}
-			else {
-				console.log(data);
-				alert("Development mode could not be enabled!")
-			}
 		});
 	});