Bug#194973: Updating problem in apt 0.5.5.1

[Brian Sipos <brian@sipos.yi.org>]

Package: apt
Version: 0.5.5.1

After upgrading from version 0.5.4, when doing an "apt-get update" or
when updating from within dselect, the following error is given:

Reading Package Lists... Error!
E: Encountered a section with no Package: header
E: Problem with MergeList
/var/lib/apt/lists/_var_cache_apt-build_repository_dists_apt-build_main_binary-i386_Packages
E: The package lists or status file could not be parsed or opened.

If apt is downgraded to version 0.5.4, updating works without error.