bitbake: toaster: Allow toaster to start without pytz

This patch allows toaster to start without pytz.

Django can work with or without pytz, but in the
time zone fix I mistakenly added a hard dependency
on this module.

This patch eliminates the hard dependency.

(Bitbake rev: 40027a6e093c3b7480bfaccbd57e0e613d9a7b71)

Signed-off-by: Alexandru DAMIAN <alexandru.damian@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/toaster/toastermain/settings.py

@@ -64,15 +64,19 @@ else:
     for dirpath, dirnames, filenames in os.walk(ZONEINFOPATH):
         for fn in filenames:
             filepath = os.path.join(dirpath, fn)
+            zonename = filepath.lstrip(ZONEINFOPATH).strip()
             try:
                 import pytz
                 from pytz.exceptions import UnknownTimeZoneError
-                zonename = filepath.lstrip(ZONEINFOPATH).strip()
-                if pytz.timezone(zonename) is not None:
-                    zonefilelist[hashlib.md5(open(filepath).read()).hexdigest()] = zonename
-            except UnknownTimeZoneError, ValueError:
-                # we expect timezone failures here, just move over
                 pass
+                try:
+                    if pytz.timezone(zonename) is not None:
+                        zonefilelist[hashlib.md5(open(filepath).read()).hexdigest()] = zonename
+                except UnknownTimeZoneError, ValueError:
+                    # we expect timezone failures here, just move over
+                    pass
+            except ImportError:
+                zonefilelist[hashlib.md5(open(filepath).read()).hexdigest()] = zonename
 
     TIME_ZONE = zonefilelist[hashlib.md5(open('/etc/localtime').read()).hexdigest()]