i18n: fix contact one more time

i18n/de.po

@@ -34,7 +34,7 @@ msgstr ""
 "</p>"
 "<div class=\"the-key\">"
 "<%=escape(hostname)%><br/><br/>"
-"# Owner: <%=escape(contact)%><br/>"
+"# Owner: <%=escape(contact or '')%><br/>"
 "# MAC: <%=escape(sysconfig.primary_mac)%><br/>"
 "key \"<%=escape(pubkey)%>\";"
 "</div>"

i18n/en.po

@@ -33,7 +33,7 @@ msgstr ""
 "</p>"
 "<div class=\"the-key\">"
 "<%=escape(hostname)%><br/><br/>"
-"# Owner: <%=escape(contact)%><br/>"
+"# Owner: <%=escape(contact or '')%><br/>"
 "# MAC: <%=escape(sysconfig.primary_mac)%><br/>"
 "key \"<%=escape(pubkey)%>\";"
 "</div>"