Merge pull request #3554 from jdemeyer/allow_no_ssl

Allow running Sphinx without ssl

sphinx/util/requests.py

@@ -36,12 +36,16 @@ except ImportError:
         # for requests < 2.4.0
         InsecureRequestWarning = None
 
-# try to load requests[security]
+# try to load requests[security] (but only if SSL is available)
+try:
+    import ssl
+except ImportError:
+    pass
+else:
     try:
         pkg_resources.require(['requests[security]'])
     except (pkg_resources.DistributionNotFound,
             pkg_resources.VersionConflict):
-    import ssl
         if not getattr(ssl, 'HAS_SNI', False):
             # don't complain on each url processed about the SSL issue
             requests.packages.urllib3.disable_warnings(