pythonPackages.nwdiag: unbreak eval

Oops, this should have been part of commit afd4a17ee5
("pythonPackages.nwdiag: move to python-modules/"). I noticed 2 seconds
to late!

pkgs/development/python-modules/nwdiag/default.nix

@@ -0,0 +1,27 @@
+{ stdenv, fetchurl, buildPythonPackage, pep8, nose, unittest2, docutils
+, blockdiag
+}:
+
+buildPythonPackage rec {
+  name = "nwdiag-1.0.3";
+
+  src = fetchurl {
+    url = "mirror://pypi/n/nwdiag/${name}.tar.gz";
+    sha256 = "0n7ary1fngxk8bk15vabc8fhnmxlh098piciwaviwn7l4a5q1zys";
+  };
+
+  buildInputs = [ pep8 nose unittest2 docutils ];
+
+  propagatedBuildInputs = [ blockdiag ];
+
+  # tests fail
+  doCheck = false;
+
+  meta = with stdenv.lib; {
+    description = "Generate network-diagram image from spec-text file (similar to Graphviz)";
+    homepage = http://blockdiag.com/;
+    license = licenses.asl20;
+    platforms = platforms.linux;
+    maintainers = with maintainers; [ bjornfor ];
+  };
+}