Fix the proxy_bypass_registry function all returning true in some cases.

src/requests/utils.py

@@ -97,6 +97,8 @@ if sys.platform == "win32":
         # '<local>' string by the localhost entry and the corresponding
         # canonical entry.
         proxyOverride = proxyOverride.split(";")
+        # filter out empty strings to avoid re.match all true.
+        proxyOverride = filter(None, proxyOverride)
         # now check if we match one of the registry values.
         for test in proxyOverride:
             if test == "<local>":