fix: do not proceed if no setting found

Removes an unecessary fetch() call as find(true)
already executes a fetch(), and changes the
control flow so that getLibKeyLink() returns
null early if no setting is found (only move on
to creating an instance of CurlWrapper if the
setting was found).

code/web/Drivers/LibKeyDriver.php

@@ -1,14 +1,13 @@
 <?php
 
 class LibKeyDriver {
-
 	public function getLibKeyLink(string $doiUrl): string | null {
 		require_once ROOT_DIR . '/sys/LibKey/LibKeySetting.php';
 		$activeLibrary = Library::getActiveLibrary();
 		$settings = new LibKeySetting();
 		$settings->whereAdd("id=$activeLibrary->libKeySettingId");
-		if ($settings->find(true)) {
-			$settings->fetch();
+		if (!$settings->find(true)) {
+			return null;
 		}
 		$curlWrapper = new CurlWrapper;
 		$response = $curlWrapper->curlGetPage("https://public-api.thirdiron.com/public/v1/libraries/" . $settings->libraryId  . "/articles/doi/" . $this->extractDoi($doiUrl) . "?access_token=" . $settings->apiKey);