[gnumeric] fix crash

[Andreas J. Guelzow <guelzow src gnome org>]

commit ccd1ec7e42a754c41f9d1a8cc3ff3141e759d6b1
Author: Andreas J Guelzow <aguelzow pyrshep ca>
Date:   Tue May 22 00:49:00 2012 -0600

    fix crash
    
    2012-05-21  Andreas J. Guelzow <aguelzow pyrshep ca>
    
    	* openoffice-read.c (oo_cell_content_end): check for NULL GString

 plugins/openoffice/ChangeLog         |    4 ++++
 plugins/openoffice/openoffice-read.c |    3 ++-
 2 files changed, 6 insertions(+), 1 deletions(-)
---
diff --git a/plugins/openoffice/ChangeLog b/plugins/openoffice/ChangeLog
index 8db1767..347a1f1 100644
--- a/plugins/openoffice/ChangeLog
+++ b/plugins/openoffice/ChangeLog
@@ -1,5 +1,9 @@
 2012-05-21  Andreas J. Guelzow <aguelzow pyrshep ca>
 
+	* openoffice-read.c (oo_cell_content_end): check for NULL GString
+
+2012-05-21  Andreas J. Guelzow <aguelzow pyrshep ca>
+
 	* openoffice-read.c (odf_style_add_condition): try to recognize some
 	of the Gnumeric specific expressions.
 
diff --git a/plugins/openoffice/openoffice-read.c b/plugins/openoffice/openoffice-read.c
index 9b1b55f..0631880 100644
--- a/plugins/openoffice/openoffice-read.c
+++ b/plugins/openoffice/openoffice-read.c
@@ -3883,7 +3883,8 @@ oo_cell_content_end (GsfXMLIn *xin, GsfXMLBlob *blob)
 		gnm_cell_assign_value (state->curr_cell, v);
 	} else if (state->text_p_for_cell.content_is_simple) {
 		odf_text_content_end (xin, blob);
-		oo_add_text_to_cell (state, state->text_p_for_cell.gstr->str, state->text_p_for_cell.attrs);
+		if (state->text_p_for_cell.gstr)
+			oo_add_text_to_cell (state, state->text_p_for_cell.gstr->str, state->text_p_for_cell.attrs);
 	}
 	oo_update_data_extent (state, 1, 1);