TT#129162 fix passwork characters check

* check that the password variable contains a value

Change-Id: Iba1cf809d5cd81b3dbbeb4686765a667e339d93f
(cherry picked from commit 63812835c0)

lib/NGCP/Panel/Utils/Auth.pm

@@ -47,7 +47,7 @@ sub perform_auth {
     my ($c, $user, $pass, $realm, $bcrypt_realm) = @_;
     my $res;
 
-    if ($pass =~ /[^[:ascii:]]/) {
+    if ($pass && $pass =~ /[^[:ascii:]]/) {
         return $res;
     }
 
@@ -111,7 +111,7 @@ sub perform_subscriber_auth {
     my ($c, $user, $domain, $pass) = @_;
     my $res;
 
-    if ($pass =~ /[^[:ascii:]]/) {
+    if ($pass && $pass =~ /[^[:ascii:]]/) {
         return $res;
     }