git-cvsserver: take care of empty passwords

Do not try to descramble them.
---
 git-cvsserver.perl |    6 +++++-

 1 files changed, 5 insertions(+), 1 deletions(-)

index 10dcc65..e842d77 100755
@@ -241,11 +241,15 @@ if ($state->{method} eq 'pserver') {

            exit 1;
        }

+        if (length($password) > 0) {
+            $password = descramble($password);
+        }
+
        my $auth_ok;
        open my $passwd, "<", $authdb or die $!;
        while (<$passwd>) {
            if (m{^\Q$user\E:(.*)}) {
-                if (crypt($user, descramble($password)) eq $1) {
+                if (crypt($user, $password) eq $1) { $auth_ok = 1;
                }
            };
--
1.7.0.4

This commit message isn't very revealing. What does this do exactly? Is the behavior with empty passwords changed now? Does git-cvsserver no longer support empty passwords? Is the on-disk format in the authdb just different? (I.e. "" instead of "A" or something). Or something else?

descramble() dies if it is called with empty string as an argument. This patch only fixes this.

The test case written to check empty passwords only checks the case when the user is not in the authdb, so the old code doesn't even call descramble().