Use default field separator.

If the field separator isn't specified through -nameopt then use
XN_FLAG_SEP_CPLUS_SPC instead of printing nothing and returing an error.

PR#2397

Reviewed-by: Tim Hudson <tjh@openssl.org>

apps/apps.c

diff --git a/apps/apps.c b/apps/apps.c
index 5c36a37..5b6a605 100644
--- a/apps/apps.c
+++ b/apps/apps.c
@@ -1074,7 +1074,11 @@
         {"ca_default", XN_FLAG_MULTILINE, 0xffffffffL},
         {NULL, 0, 0}
     };
-    return set_multi_opts(flags, arg, ex_tbl);
+    if (set_multi_opts(flags, arg, ex_tbl) == 0)
+        return 0;
+    if ((*flags & XN_FLAG_SEP_MASK) == 0)
+        *flags |= XN_FLAG_SEP_CPLUS_SPC;
+    return 1;
 }
 
 int set_ext_copy(int *copy_type, const char *arg)

doc/apps/x509.pod

diff --git a/doc/apps/x509.pod b/doc/apps/x509.pod
index a06393d..d4790605 100644
--- a/doc/apps/x509.pod
+++ b/doc/apps/x509.pod
@@ -542,7 +542,8 @@
 "space" additionally place a space after the separator to make it
 more readable. The B<sep_multiline> uses a linefeed character for
 the RDN separator and a spaced B<+> for the AVA separator. It also
-indents the fields by four characters.
+indents the fields by four characters. If no field separator is specified
+then B<sep_comma_plus_space> is used by default.
 
 =item B<dn_rev>