tree 0ccc0b0e99a68dacdec3d898eedf142e23cc8565
parent abe8c4ce82803a2044f23996872d5a7fd5d2328b
author Elliott Hughes <enh@google.com> 1398123644 -0700
committer Elliott Hughes <enh@google.com> 1398124168 -0700

Allow empty rules in a RuleBasedCollator.

This is allowed by the CLDR specification, and we were already allowing
most forms of empty rules, just not the zero-length string.

Change-Id: I3c2a020aac23e54f8044defbfe2e2a5b600e454c