[rfc][icedtea-web] fix for " html-gen.sh: Don't try to call hg if .hg directory isn't present"

[Jiri Vanek]

http://icedtea.classpath.org/bugzilla/show_bug.cgi?id=2779

The fix came with the bug report. I had tested an checked.
I added following hunk to it:
+if [ ! -e html-gen ]; then
+	echo "No html-gen directory, exiting. See Makefile.am for usage"
+	exit 1
+fi
+

I will push this tomorrow to both head and 1.6


J.
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