replace extractor.request() 'expect' argument

with
- 'fatal': allow 4xx status codes
- 'notfound': raise NotFoundError on 404

gallery_dl/extractor/sexcom.py

@@ -49,10 +49,10 @@ class SexcomExtractor(Extractor):
                 return
             url = text.urljoin(self.root, url)
 
-    def _parse_pin(self, url, expect=range(400, 429)):
-        response = self.request(url, expect=expect)
+    def _parse_pin(self, url):
+        response = self.request(url, fatal=False)
         if response.status_code >= 400:
-            self.log.warning("Unable to fetch %s (%s: %s)",
+            self.log.warning('Unable to fetch %s ("%s: %s")',
                              url, response.status_code, response.reason)
             return None
         extr = text.extract_from(response.text)