Fix typo in splitEMInit when some clusters are empty or nearly so

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/htsfilter@75 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
- Minor bug correction regarding numeric vs character class in splitEMInit function

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/htsfilter@76 edb9625f-4e0d-4859-8d74-9fd3b1da38cb