accounts: handle OfflineImapError severity FOLDER

Throw an OfflineImapError when SELECTing a folder is unsuccessful and
bail out with a FOLDER serverity. In accounts.py catch all
OfflineImapErrors and either just log the error and skip the folder or
bubble it up if it's severe.

Signed-off-by: Sebastian Spaeth <Sebastian@SSpaeth.de>
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>

offlineimap/accounts.py

@@ -393,6 +393,13 @@ def syncfolder(accountname, remoterepos, remotefolder, localrepos,
         localrepos.restore_atime()
     except (KeyboardInterrupt, SystemExit):
         raise
+    except OfflineImapError, e:
+        # bubble up severe Errors, skip folder otherwise
+        if e.severity > OfflineImapError.ERROR.FOLDER:
+            raise
+        else:
+            ui.warn("Aborting folder sync '%s' [acc: '%s']\nReason was: %s" %\
+                        (localfolder.name, accountname, e.reason))
     except:
         ui.warn("ERROR in syncfolder for %s folder %s: %s" % \
                 (accountname,remotefolder.getvisiblename(),