[PATCH] Fix a crash when no trip exists

[Miika Turkia]

When there are no trips at all, we have to skip the Yearly statistics
alltogether, including the header line (that should display all the
dives added together).

Signed-off-by: Miika Turkia <miika.turkia at gmail.com>
---
 qt-ui/models.cpp | 2 +-
 statistics.c     | 1 -
 2 files changed, 1 insertion(+), 2 deletions(-)

diff --git a/qt-ui/models.cpp b/qt-ui/models.cpp
index 12e17c8..4c2803a 100644
--- a/qt-ui/models.cpp
+++ b/qt-ui/models.cpp
@@ -1448,7 +1448,7 @@ void YearlyStatisticsModel::update_yearly_stats()
 	}
 
 
-	if (stats_by_trip != NULL ) {
+	if (stats_by_trip != NULL && stats_by_trip[0].is_trip == TRUE) {
 		YearStatisticsItem *item = new YearStatisticsItem(stats_by_trip[0]);
 		for (i = 1; stats_by_trip != NULL && stats_by_trip[i].is_trip; ++i) {
 			YearStatisticsItem *iChild = new YearStatisticsItem(stats_by_trip[i]);
diff --git a/statistics.c b/statistics.c
index 807539f..18666bd 100644
--- a/statistics.c
+++ b/statistics.c
@@ -127,7 +127,6 @@ void process_all_dives(struct dive *dive, struct dive **prev_dive)
 	memset(stats_monthly, 0, size);
 	memset(stats_by_trip, 0, size);
 	stats_yearly[0].is_year = TRUE;
-	stats_by_trip[0].is_trip = TRUE;
 
 	/* this relies on the fact that the dives in the dive_table
 	 * are in chronological order */
-- 
1.8.3.2