[goffice] Don't crash when no valid data is available. [#684047]

[Jean BrÃfort <jbrefort src gnome org>]

commit 6f2f18010e18aa0084a17e1431d7ae042d8e36f1
Author: Jean Brefort <jean brefort normalesup org>
Date:   Sat Sep 15 08:46:10 2012 +0200

    Don't crash when no valid data is available. [#684047]

 ChangeLog                            |    6 ++++++
 plugins/plot_distrib/gog-histogram.c |    3 +++
 2 files changed, 9 insertions(+), 0 deletions(-)
---
diff --git a/ChangeLog b/ChangeLog
index f266c5a..9677d16 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2012-09-15  Jean Brefort  <jean brefort normalesup org>
+
+	* plugins/plot_distrib/gog-histogram.c
+	(gog_histogram_plot_series_update): don't crash when no valid data is
+	available. [#684047]
+
 2012-09-13  Jean Brefort  <jean brefort normalesup org>
 
 	* plugins/plot_xy/Makefile.am: add XYMinMax plot. [#683493]
diff --git a/plugins/plot_distrib/gog-histogram.c b/plugins/plot_distrib/gog-histogram.c
index 604b11b..987e67c 100644
--- a/plugins/plot_distrib/gog-histogram.c
+++ b/plugins/plot_distrib/gog-histogram.c
@@ -987,6 +987,7 @@ gog_histogram_plot_series_update (GogObject *obj)
 			}
 			if (width > 0. && (y || y_)) {
 				double m, M;
+				/* ignore nans */
 				if (y) {
 					m = (y_)? (MIN (y[0], y_[0])): y[0];
 					M = (y_)? (MAX (y[y_len-1], y_[y__len-1])): y[y_len-1];
@@ -994,6 +995,8 @@ gog_histogram_plot_series_update (GogObject *obj)
 					m = y_[0];
 					M = y_[y__len-1];
 				}
+				if (!go_finite (m) || !go_finite (M))
+					return;
 				/* round m */
 				m = floor ((m - origin)/ width) * width + origin;
 				x_len = ceil ((M - m) / width) + 1;