From fdab21e616bf8e16d077ac92b7af9760f202fda5 Mon Sep 17 00:00:00 2001
From: Avdi Grimm <avdi@avdi.org>
Date: Mon, 16 Jul 2012 00:32:54 -0400
Subject: [PATCH] Only zip up assets if there are any.

---
 lib/stages/package/html.mk | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/stages/package/html.mk b/lib/stages/package/html.mk
index f1a5fee..a147dfd 100644
--- a/lib/stages/package/html.mk
+++ b/lib/stages/package/html.mk
@@ -9,6 +9,8 @@ outputs			= $(OP_BOOK_NAME).html.zip
 %.html.zip: %.html $(LOCAL_ASSET_TARGETS) $(COMPOSITE_STYLESHEET)
 	$(ZIP) $(ZIPFLAGS) $@ -j $<
 	$(ZIP) $(ZIPFLAGS) $@ -j $(COMPOSITE_STYLESHEET)
-	$(ZIP) $(ZIPFLAGS) $@ $(ASSET_TARGETS)
+	if [ -n "$(ASSET_TARGETS)" ]; then \
+		$(ZIP) $(ZIPFLAGS) $@ $(ASSET_TARGETS); \
+	fi
 	$(ADD_FONTS_TO_ARCHIVE)