Handle null in base64_encode (#8321)

* Handle null in base64_encode
https://github.com/FreshRSS/FreshRSS/discussions/8314#discussioncomment-15269370

* PHPDoc

app/Models/FeedDAO.php

@@ -39,7 +39,7 @@ class FreshRSS_FeedDAO extends Minz_ModelPdo {
 
 	/**
 	 * @param array{id?:int,url:string,kind:int,category:int,name:string,website:string,description:string,lastUpdate:int,priority?:int,
-	 * 	pathEntries?:string,httpAuth:string,error:int|bool,ttl?:int,attributes?:string|array<string|mixed>} $valuesTmp
+	 * 	pathEntries?:string,httpAuth?:string,error:int|bool,ttl?:int,attributes?:string|array<string|mixed>} $valuesTmp
 	 */
 	public function addFeed(array $valuesTmp): int|false {
 		if (empty($valuesTmp['id'])) {	// Auto-generated ID
@@ -75,7 +75,7 @@ SQL;
 			$valuesTmp['lastUpdate'],
 			isset($valuesTmp['priority']) ? (int)$valuesTmp['priority'] : FreshRSS_Feed::PRIORITY_MAIN_STREAM,
 			mb_strcut($valuesTmp['pathEntries'], 0, 4096, 'UTF-8'),
-			base64_encode($valuesTmp['httpAuth']),
+			base64_encode($valuesTmp['httpAuth'] ?? ''),
 			isset($valuesTmp['error']) ? (int)$valuesTmp['error'] : 0,
 			isset($valuesTmp['ttl']) ? (int)$valuesTmp['ttl'] : FreshRSS_Feed::TTL_DEFAULT,
 			is_string($valuesTmp['attributes']) ? $valuesTmp['attributes'] : json_encode($valuesTmp['attributes'], JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE),
@@ -181,7 +181,7 @@ SQL;
 			$set .= '`' . $key . '`=?, ';
 
 			if ($key === 'httpAuth') {
-				$valuesTmp[$key] = base64_encode($v);
+				$valuesTmp[$key] = is_string($v) ? base64_encode($v) : '';
 			} elseif ($key === 'attributes') {
 				$valuesTmp[$key] = is_string($valuesTmp[$key]) ? $valuesTmp[$key] : json_encode($valuesTmp[$key], JSON_UNESCAPED_SLASHES);
 			}
@@ -315,7 +315,7 @@ SQL;
 	}
 
 	/** @return Traversable<array{id:int,url:string,kind:int,category:int,name:string,website:string,description:string,lastUpdate:int,priority?:int,
-	 * 	pathEntries?:string,httpAuth:string,error:int|bool,ttl?:int,attributes?:string}> */
+	 * 	pathEntries?:string,httpAuth?:string,error:int|bool,ttl?:int,attributes?:string}> */
 	public function selectAll(): Traversable {
 		$sql = <<<'SQL'
 SELECT id, url, kind, category, name, website, description, `lastUpdate`,
@@ -326,7 +326,7 @@ SQL;
 		if ($stm !== false) {
 			while (is_array($row = $stm->fetch(PDO::FETCH_ASSOC))) {
 				/** @var array{id:int,url:string,kind:int,category:int,name:string,website:string,description:string,lastUpdate:int,priority?:int,
-				 *	pathEntries?:string,httpAuth:string,error:int,ttl?:int,attributes?:string} $row */
+				 *	pathEntries?:string,httpAuth?:string,error:int,ttl?:int,attributes?:string} $row */
 				yield $row;
 			}
 		} else {