No longer create empty list items for possible locations of the CA file

Signed-off-by: Keith Bowes <[email protected]>

Author: keithbowes

offlineimap/utils/distro_utils.py

@@ -72,17 +72,24 @@ def get_os_sslcertfile_searchpath():
     at all.
     """
     os_name = get_os_name()
-    location = __DEF_OS_LOCATIONS.get(os_name, [''])
+    location = __DEF_OS_LOCATIONS.get(os_name, [])
 
     try:
         import ssl
         verify_paths = ssl.get_default_verify_paths()
-        location += [os.getenv(verify_paths.openssl_cafile_env) or '']
-        location += [verify_paths.cafile or '']
+        cafile_by_envvar = os.getenv(verify_paths.openssl_cafile_env)
+        if cafile_by_envvar is not None:
+            location += [cafile_by_envvar]
+        cafile_resolved = verify_paths.cafile
+        if cafile_resolved is not None:
+            location += [cafile_resolved]
+        cafile_hardcoded = verify_paths.openssl_cafile
+        if cafile_hardcoded is not None:
+            location += [cafile_hardcoded]
     except AttributeError:
         pass
     finally:
-        if location.count('') == len(location):
+        if len(location) == 0:
             return None
 
     return location