[Xen-devel][PATCH]Fix the issue that guest cannot boot if set empty cdrom in config file

["Xu, Dongxiao" <dongxiao.xu@xxxxxxxxx>]

Hi, Keir,
      This attached patch fixes the issue that guest can not boot if set
empty cdrom in configuration file. 
(For example, disk = [ 'file:/images/a.img', ',hdc:cdrom,r' ])

This is because function "uname = config.get('uname', '')" returns ''
but not None if uname is not in config variable. 

Signed-off-by: Xu Dongxiao <dongxiao.xu@xxxxxxxxx>

Best Regards,
--Dongxiao

Attachment: blk_python.patch
Description: blk_python.patch

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