Revert "Don't allow an empty Subject when creating a Certificate"

This reverts commit e505f1e8.

Empty Subjects should be permissible.
Reviewed-by: NRichard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/5444)

apps/ca.c

@@ -1404,10 +1404,6 @@ static int do_body(X509 **xret, EVP_PKEY *pkey, X509 *x509,
         BIO_printf(bio_err, "The Subject's Distinguished Name is as follows\n");
 
     name = X509_REQ_get_subject_name(req);
-    if (X509_NAME_entry_count(name) == 0) {
-        BIO_printf(bio_err, "Error: The supplied Subject is empty\n");
-        goto end;
-    }
     for (i = 0; i < X509_NAME_entry_count(name); i++) {
         ne = X509_NAME_get_entry(name, i);
         str = X509_NAME_ENTRY_get_data(ne);
@@ -1569,12 +1565,6 @@ static int do_body(X509 **xret, EVP_PKEY *pkey, X509 *x509,
             goto end;
     }
 
-    if (X509_NAME_entry_count(subject) == 0) {
-        BIO_printf(bio_err,
-                   "Error: After applying policy the Subject is empty\n");
-        goto end;
-    }
-
     if (verbose)
         BIO_printf(bio_err,
                    "The subject name appears to be ok, checking data base for clashes\n");