MT#8559 Adapt URI field helpers to empty value (on creation).

(cherry picked from commit ca15c7a2d1e8577bb1ff2f716064a6ab4de77ed2)

lib/NGCP/Panel/Field/URI.pm

@@ -68,7 +68,7 @@ has '+deflate_method'  => ( default => sub { \&uri_deflate } );
 
 sub uri_deflate {
     my ( $field, $v ) = @_;
-
+    return unless($v);
     my $c = $field->form->ctx;
     return $v unless($c);