Mentioned in [6281] on Meta SVN:
Plugin Directory: Checksums: Move the `$skip_bad_files` into the non-existant file branch to avoid accidentally clobbering a real file.

Mentioned in [6280] on Meta SVN:
Plugin Directory: Checksums: Correctly handle filenames with spaces, previously the filename was being truncated.

Created ticket #3335 on Meta Trac:
Plugin Checksum generation failing with filenames containing whitespace