KMail Problems with Latest Dovecot

I am using Dovecot IMAP on an Debian Sid box. Every major update of this is a 
big problem. Anyway, it now seems to require a namespace but gives an error is 
that namespace has a blank prefix. So I am forced to enter SOMETHING. Then it 
works and my localhost (using KMail) and my Android can use it.

However, KMail tries to open a folder based on that spurious prefix and gives 
an error box time after time. A harmless pain in the ...

The prefix is meant to facilitate a tree of namespaces, I believe, not to 
designate a mail folder.

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