Adds . to blank lines in Google license

contrib/DEBIAN/copyright

@@ -428,7 +428,7 @@ License: BSD-3clause-Google
  Redistribution and use in source and binary forms, with or without
  modification, are permitted provided that the following conditions are
  met:
-
+ .
     * Redistributions of source code must retain the above copyright
       notice, this list of conditions and the following disclaimer.
     * Redistributions in binary form must reproduce the above
@@ -438,7 +438,7 @@ License: BSD-3clause-Google
     * Neither the name of Google Inc. nor the names of its
       contributors may be used to endorse or promote products derived from
       this software without specific prior written permission.
-
+ .
  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR