pluginmgr: explicitly pass the decoder exception to callers
pluginmgr: explicitly pass the decoder exception to callers

This makes things more explicit and adds a comment to the decode loop.

Signed-off-by: David Aguilar <davvid@gmail.com>

git-svn-id: 93f2f39c93ae088b792869c1b97110104553f60a@54 ba5bf794-d048-0410-8f42-e1fdefefffeb

eoghanmurray/jsonpickle_prev,eoghanmurray/jsonpickle_prev,mandx/jsonpickle,dongguangming/jsonpickle,mandx/jsonpickle,mandx/jsonpickle,dongguangming/jsonpickle,dongguangming/jsonpickle,mandx/jsonpickle,dongguangming/jsonpickle