invoice.slim in polish_invoicer-0.0.16

- old
+ new

@@ -28,10 +28,10 @@
         .col-xs-6
           h4 Nabywca
           - buyer.each do |line|
             = line
             br
-          - if buyer_nip
+          - if buyer_nip.to_s.strip != ''
             = "NIP: #{buyer_nip}"
           - if recipient.any?
             h4 Odbiorca
             - recipient.each do |line|
               = line