[tumblr] Have tumblr_get_contact_by_url return null for unsuccessful probe

- Add result setting for unsuccessful authoritative probe

tumblr/tumblr.php

@@ -99,6 +99,11 @@ function tumblr_probe_detect(array &$hookData)
 	}
 
 	$hookData['result'] = tumblr_get_contact_by_url($hookData['uri']);
+
+	// Authoritative probe should set the result even if the probe was unsuccessful
+	if ($hookData['network'] == Protocol::TUMBLR && empty($hookData['result'])) {
+		$hookData['result'] = [];
+	}
 }
 
 function tumblr_item_by_link(array &$hookData)
@@ -1213,24 +1218,25 @@ function tumblr_enabled_for_user(int $uid)
  * Get a contact array from a Tumblr url
  *
  * @param string $url
- * @return array
+ * @return array|null
+ * @throws \Friendica\Network\HTTPException\InternalServerErrorException
  */
-function tumblr_get_contact_by_url(string $url): array
+function tumblr_get_contact_by_url(string $url): ?array
 {
 	$consumer_key = DI::config()->get('tumblr', 'consumer_key');
 	if (empty($consumer_key)) {
-		return [];
+		return null;
 	}
 
 	if (!preg_match('#^https?://tumblr.com/(.+)#', $url, $matches) && !preg_match('#^https?://www\.tumblr.com/(.+)#', $url, $matches) && !preg_match('#^https?://(.+)\.tumblr.com#', $url, $matches)) {
 		try {
 			$curlResult = DI::httpClient()->get($url);
 		} catch (\Exception $e) {
-			return [];
+			return null;
 		}
 		$html = $curlResult->getBody();
 		if (empty($html)) {
-			return [];
+			return null;
 		}
 		$doc = new DOMDocument();
 		@$doc->loadHTML($html);
@@ -1244,7 +1250,7 @@ function tumblr_get_contact_by_url(string $url): array
 	}
 
 	if (empty($blog)) {
-		return [];
+		return null;
 	}
 
 	Logger::debug('Update Tumblr blog data', ['url' => $url]);
@@ -1253,7 +1259,7 @@ function tumblr_get_contact_by_url(string $url): array
 	$body = $curlResult->getBody();
 	$data = json_decode($body);
 	if (empty($data)) {
-		return [];
+		return null;
 	}
 
 	$baseurl = 'https://tumblr.com';