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abaco: dont abort if theres no contenttype

--- a/sys/src/cmd/abaco/urls.c

+++ b/sys/src/cmd/abaco/urls.c

@@ -59,16 +59,15 @@

 	char buf[BUFSIZE];

 	int fd, n;

+	n = 0;

 	snprint(buf, sizeof(buf), "%s/%d/%s", webmountpt, conn, s);

 	fd = open(buf, OREAD);

-	if(fd < 0)

-		error("can't open attr file");

-

-	n = read(fd, buf, sizeof(buf)-1);

-	if(n < 0)

-		error("can't read");

-

-	close(fd);

+	if(fd >= 0){

+		n = read(fd, buf, sizeof(buf)-1);

+		if(n < 0)

+			n = 0;

+		close(fd);

+	}

 	buf[n] = '\0';

 	return (Runestr){runesmprint("%s", buf), n};

 }

-- 

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