nelts returned from a registry key may be zero... make it so.
  [We previously would return an array of one empty element.]

PR: 9410
Submitted by:	Vasiliy Gagin <vasiliy@gazooc.com>


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@95284 13f79535-47bb-0310-9956-ffa450edef68