code cleanup: add empty table structures

It seemed to make sense to combine all three types in one commit.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/core/dive.h b/core/dive.h
index b642c3031..e54006dd8 100644
--- a/core/dive.h
+++ b/core/dive.h
@@ -133,6 +133,8 @@ typedef struct dive_table {
 	struct dive **dives;
 } dive_table_t;
 
+static const dive_table_t empty_dive_table = { 0, 0, (struct dive **)0 };
+
 struct picture;
 struct dive_site;
 struct dive_site_table;