Allow --reconfigure and --wipe of empty builddir

This allows to run setup command regardless whether the builddir has
been configured or not previously. This is useful for example with
scripts that always repeat all options.
  meson setup builddir --reconfigure -Dfoo=bar

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diff --git a/docs/markdown/snippets/reconfigure.md b/docs/markdown/snippets/reconfigure.md
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+## Allow --reconfigure and --wipe of empty builddir
+
+`meson setup --reconfigure builddir` and `meson setup --wipe builddir` are now
+accepting `builddir/` to be empty or containing a previously failed setup attempt.
+Note that in that case previously passed command line options must be repeated
+as only a successful build saves configured options.
+
+This is useful for example with scripts that always repeat all options,
+`meson setup builddir --wipe -Dfoo=bar` will always work regardless whether
+it is a first invocation or not.