Don't create a $(pkgdatadir) if there's nothing to be installed in it.

[pspp] / ChangeLog

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+2006-08-21  Bruno Haible <bruno@clisp.org>
+
+       * gnulib-tool (func_emit_lib_Makefile_am, func_emit_tests_Makefile_am):
+       Emit a pkgdata_DATA variable only if some snippets add contents to it.
+       Reported by Martin Lambers <marlam@marlam.de>.
+
 2006-08-21  Mark D. Baushke  <mdb@gnu.org>
             Bruno Haible <bruno@clisp.org>