yum list available weird output

Gerry Reno <[email protected]>
Newsgroups gmane.linux.rpm.yum
Message-ID <[email protected]>
I run this command:
yum -q list available $(rpm -qa --queryformat=%{name}\n) | grep "^ "
                                       1.0.0-2.fc11                   
preupgrade
                                       0.1.0-6.fc11                   
preupgrade
                                                                      
rawhide 

This output is strange because there are no package names.  And it is 
confusing one of my scripts.  Is there a package named <blank>?  Or a 
package without a 'name' field?

Regards,
Gerry
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