[downloader:http] catch both possible SSLException instances

With pyOpenSSL installed, but disabled, the SSLError exception
would be set to the one from pyOpenSSL, which could never get raised.

This commit solves this problem by catching both, the native SSLError
exception as well as the one from pyOpenSSL (if available.1)

CHANGELOG.md

@@ -1,5 +1,7 @@
 # Changelog
 
+## Unreleased
+
 ## 1.12.0 - 2019-12-08
 ### Additions
 - [flickr] support 3k, 4k, 5k, and 6k photo sizes ([#472](https://github.com/mikf/gallery-dl/issues/472))
@@ -12,7 +14,7 @@
 - [deviantart] ensure consistent username capitalization ([#455](https://github.com/mikf/gallery-dl/issues/455))
 - [directlink] split `{path}` into `{path}/{filename}.{extension}`
 - [twitter] update metadata fields with user/author information
-- [postprocessor:metadata] filter private entries & rename 'format' to 'content-format'
+- [postprocessor:metadata] filter private entries & rename `format` to `content-format`
 - Enable `cookies-update` by default
 ### Fixes
 - [2chan] fix metadata extraction

gallery_dl/downloader/http.py

@@ -15,10 +15,11 @@ from requests.exceptions import RequestException, ConnectionError, Timeout
 from .common import DownloaderBase
 from .. import text
 
+from ssl import SSLError
 try:
-    from OpenSSL.SSL import Error as SSLError
+    from OpenSSL.SSL import Error as OpenSSLError
 except ImportError:
-    from ssl import SSLError
+    OpenSSLError = SSLError
 
 
 class HttpDownloader(DownloaderBase):
@@ -143,7 +144,7 @@ class HttpDownloader(DownloaderBase):
                 # download content
                 try:
                     self.receive(response, file)
-                except (RequestException, SSLError) as exc:
+                except (RequestException, SSLError, OpenSSLError) as exc:
                     msg = str(exc)
                     print()
                     continue

gallery_dl/version.py

@@ -6,4 +6,4 @@
 # it under the terms of the GNU General Public License version 2 as
 # published by the Free Software Foundation.
 
-__version__ = "1.12.0"
+__version__ = "1.12.1-dev"