zerobin: disable tests because it doesn't have any

It does however contain a copy of cherrypy that doesn't get installed,
which fails tests when it tries to import from cherrypy and gets imports
from the version provided by Nix (which is probably not the same one as
is having its tests run).

pkgs/top-level/python-packages.nix

@@ -31286,6 +31286,9 @@ EOF
       lockfile
       clize
     ];
+    # zerobin doesn't have any tests, but includes a copy of cherrypy which
+    # can wrongly fail the check phase.
+    doCheck = false;
     meta = {
       description = "A client side encrypted pastebin";
       homepage = "http://0bin.net/";