segfault with new conflict resolver

Hi,

trying out the new conflict resolver. Ran into a segfault on my first try:

libsvn_client\conflicts.c, function find_modified_rev():

if there is no author for a commit, then we get a segfault here:

   /* No paths were changed in this revision. Nothing to do. */
   if (! log_entry->changed_paths2)
     return SVN_NO_ERROR;

   details = apr_pcalloc(b->result_pool, sizeof(*details));
   details->rev = log_entry->revision;
   author = svn_hash_gets(log_entry->revprops, SVN_PROP_REVISION_AUTHOR);

*** now 'author' is nullptr, and the next line crashes:
   details->author = apr_pstrdup(b->result_pool, author->data);

   details->text_modified = svn_tristate_unknown;
   details->props_modified = svn_tristate_unknown;
   details->children_modified = svn_tristate_unknown;

Stefan

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