invoice.slim in polish_invoicer-0.0.3

- old
+ new

@@ -36,10 +36,11 @@
         .col-xs-6
           h4 Nabywca
           - buyer.each do |line|
             = line
             br
-          = "NIP: #{buyer_nip}"
+          - if buyer_nip
+            = "NIP: #{buyer_nip}"
 
       hr
 
       .row
         .col-xs-3