Squid-2.2.DEVEL3: Blank content types logged in store.log
    If the origin server sent a blank content type, then store.log logged
    a blank field, making it hard to parse. This patch logs "unknown" as
    is logged when no content type is provided at all.

Index: squid/src/store_log.c
diff -u squid/src/store_log.c:1.1.1.5 squid/src/store_log.c:1.1.1.5.42.1
--- squid/src/store_log.c:1.1.1.5	Thu Jul 23 22:38:02 1998
+++ squid/src/store_log.c	Sat Feb 27 19:10:52 1999
@@ -71,7 +71,7 @@
 	(int) reply->date,
 	(int) reply->last_modified,
 	(int) reply->expires,
-	strBuf(reply->content_type) ? strBuf(reply->content_type) : "unknown",
+	strLen(reply->content_type) ? strBuf(reply->content_type) : "unknown",
 	reply->content_length,
 	(int) (mem->inmem_hi - mem->reply->hdr_sz),
 	RequestMethodStr[mem->method],