Handle single-line and empty commit subjects

If commit object ends with \0 after subject line, then info->subject
was not set.

This commit fixes this and also sets subject to ** empty ** if it
would otherwise be empty, so that there is something to click on.

Signed-off-by: Lars Hjemli <hjemli@gmail.com>

parsing.c

@@ -234,14 +234,19 @@ struct commitinfo *cgit_parse_commit(struct commit *commit)
 		p = strchr(p, '\n') + 1;
 
 	t = strchr(p, '\n');
-	if (t && *t) {
-		ret->subject = substr(p, t);
+	if (t) {
+		if (*t == '\0')
+			ret->subject = strdup("** empty **");
+		else
+			ret->subject = substr(p, t);
 		p = t + 1;
 
 		while (*p == '\n')
 			p = strchr(p, '\n') + 1;
 		ret->msg = p;
-	}
+	} else
+		ret->subject = substr(p, p+strlen(p));
+
 	return ret;
 }