fix empty directories

tests/Empty directories

@@ -0,0 +1,8 @@
+#!/bin/sh
+
+tmp=$(mktemp -d)
+mkdir -p $tmp/test
+../urchin $tmp/test
+exit_code=$?
+rm -R $tmp
+exit $exit_code

urchin

@@ -106,6 +106,10 @@ recurse() {
       fi
 
       for test in *; do
+        if test "$test" = '*' && ! test -e $test; then
+          # The directory is empty.
+          break
+        fi
         urchin_source setup
 
         set +e