[OE-core] [PATCH] lib/oe/distro_check: don't set empty proxy keys

[Ross Burton]

If the proxies dictionary has a proxy set to None urllib will throw an exception
instead of not using a proxy (abridged stack):

File: '/home/ross/Yocto/poky/meta/lib/oe/distro_check.py', lineno: 43, function: get_links_from_url
 *** 0043:    with create_socket(url,d) as sock:
     0044:        webpage = sock.read()
File: '/home/ross/Yocto/poky/meta/lib/oe/distro_check.py', lineno: 5, function: create_socket
     0003:def create_socket(url, d):
     0004:    import urllib
 *** 0005:    socket = urllib.urlopen(url, proxies=get_proxies(d))
File: '/usr/lib/python2.7/urllib.py', lineno: 87, function: urlopen
     0086:    if data is None:
 *** 0087:        return opener.open(url)
File: '/usr/lib/python2.7/urllib.py', lineno: 203, function: open
     0201:        else:
     0202:            proxy = None
 *** 0203:        name = 'open_' + urltype
     0204:        self.type = urltype
     0205:        name = name.replace('-', '_')
Exception: TypeError: cannot concatenate 'str' and 'NoneType' objects

Filter out unset values so that the dictionary only has valid assignments in.

Signed-off-by: Ross Burton <ross.burton at intel.com>
---
 meta/lib/oe/distro_check.py | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/meta/lib/oe/distro_check.py b/meta/lib/oe/distro_check.py
index f92cd2e..8655a6f 100644
--- a/meta/lib/oe/distro_check.py
+++ b/meta/lib/oe/distro_check.py
@@ -9,10 +9,12 @@ def create_socket(url, d):
         socket.close()
 
 def get_proxies(d):
-    import os
-    proxykeys = ['http', 'https', 'ftp', 'ftps', 'no', 'all']
-    proxyvalues = map(lambda key: d.getVar(key+'_proxy', True), proxykeys)
-    return dict(zip(proxykeys, proxyvalues))
+    proxies = {}
+    for key in ['http', 'https', 'ftp', 'ftps', 'no', 'all']:
+        proxy = d.getVar(key + '_proxy', True)
+        if proxy:
+            proxies[key] = proxy
+    return proxies
 
 def get_links_from_url(url, d):
     "Return all the href links found on the web location"
-- 
2.1.4