Merged revision(s) 1429401 from lucene/dev/trunk:
SOLR-4275: Fix TrieTokenizer to no longer throw StringIndexOutOfBoundsException in admin UI / AnalysisRequestHandler when you enter no number to tokenize

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1429402 13f79535-47bb-0310-9956-ffa450edef68