bgpwtf/invoice: hide invoicee VAT number when not given

Also re-add go-bindata to WORKSPACE, something nuked it.

Change-Id: I723ebee7f843d0135a3e1121e2e93ae5fe56bc4b
diff --git a/bgpwtf/invoice/templates/invoice_pl.html b/bgpwtf/invoice/templates/invoice_pl.html
index df49da8..15f5d08 100644
--- a/bgpwtf/invoice/templates/invoice_pl.html
+++ b/bgpwtf/invoice/templates/invoice_pl.html
@@ -143,7 +143,7 @@
                     {{ if .USCustomer }}
                     <li>EIN: {{ .InvoiceeVAT }}</li>
                     <li><b>(VAT zero rate)</b></li>
-                    {{ else }}
+                    {{ else if .InvoiceeVAT }}
                     <li><b>NIP:</b> {{ .InvoiceeVAT }}</li>
                     {{ end }}