invoice-en.slim in polish_invoicer-0.0.16

- old
+ new

@@ -34,10 +34,10 @@
           h6.small
             em Buyer
           - buyer.each do |line|
             = line
             br
-          - if buyer_nip
+          - if buyer_nip.to_s.strip != ''
             = "VAT no: #{buyer_nip}"
           - if recipient.any?
             h4 Odbiorca
             h6.small
               em Recipient