Add empty line in signed sample wordlists.

We ignore empty lines also in signed wordlists. To check it, we need
an empty line in the sample.

tests/sample_signed_wordlist.asc

@@ -2,15 +2,16 @@
 Hash: SHA512
 
 foo
+
 bar
 - -dash-at-start
 baz
 -----BEGIN PGP SIGNATURE-----
 Version: GnuPG v1
 
-iJwEAQEKAAYFAlWwx40ACgkQ+5ktCoLaPzRkPAP/S8PNChM+05K3k8d83QDcuAxv
-83ClmdWaO/3nZGAsm83bBBPAZHJWrXPERBaHqtnNYxtuLpI8hucF4sihhubRtF0j
-uTY8bDews0Du7NGhBMVXoTxvAR5Dl6tuYa4ke9xMhfXuovqI2456Vdi8i9hGSYZp
-AkqJZfPMwSi8H1bfSbs=
-=zV5u
+iJwEAQEKAAYFAlW00GEACgkQ+5ktCoLaPzSutwP8DVgdjBFqRXNKaZlvd8pR+P3k
+8xx5XLC0OFwZQFx4Ls8xl3+/xfvCNxCGSZjD6BGPzNZCK7bmQQYWcrsoEyX5jAC3
+dXjAPj0nct/PkJQlrUjUI2qrO0dFfU7sRj0Gn9TOlQQkKoQVwy7pY/6HaScGNepL
+J8BNUPYdOWeVgxY1jSY=
+=WXfu
 -----END PGP SIGNATURE-----