invoice.slim in polish_invoicer-0.0.15

- old
+ new

@@ -120,10 +120,10 @@
             br
             - comments.each do |line|
               = line
               br
 
-      - if no_vat_reason
+      - if no_vat_reason.to_s.strip != ''
         br
         p
           b Podstawa zwolnienia z podatku VAT:
           br
           = no_vat_reason