More work on issue #3890 ("'svnrdump load' does not map revisions like 'svnadmin load' does").
More work on issue #3890 ("'svnrdump load' does not map revisions like
'svnadmin load' does").

* subversion/svnrdump/load_editor.c
  (set_node_property): Don't try to rejigger the mergeinfo property
    when its value is NULL.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1128034 13f79535-47bb-0310-9956-ffa450edef68

YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion