File name '' is excluded from rsync

When I rsync from my notebook to numrel02, simfactory constructs the following command:

Executing: /bin/bash -c "{ :; } && rsync --rsh='ssh ' --rsync-path=/usr/local/packages/numrel/rsync-3.0.7/bin/rsync --archive --hard-links --sparse --verbose --progress --partial --stats --compress --delete --delete-excluded --filter 'protect .pyc' --exclude '_darcs' --exclude 'CVS' --exclude 'doxygen' --exclude '.#' --exclude '.DS_Store' --exclude '.git' --exclude '.hg' --exclude '.svn' --exclude '~' --exclude '.pyc' --exclude '' CONTRIBUTORS COPYRIGHT Makefile arrangements lib repos simfactory src cactus.config perl-simfactory eschnett@numrel02.cct.lsu.edu:/home/eschnett/EinsteinToolkit-hg"

This contains the option --exclude '', which seems as if it should not be there.

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