[gnumeric] Fuzzed file fixes. [#751907]

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

commit 37604a5124ba4b9405ce214a2a7d92dd1472b5b6
Author: Andreas J. Guelzow <aguelzow pyrshep ca>
Date:   Fri Jul 3 12:38:37 2015 -0600

    Fuzzed file fixes.  [#751907]
    
    2015-07-03  Andreas J. Guelzow <aguelzow pyrshep ca>
    
        * openoffice-read.c (oo_add_text_to_cell): check whether the cell
        has a value.

 NEWS                                 |    2 +-
 plugins/openoffice/ChangeLog         |    5 +++++
 plugins/openoffice/openoffice-read.c |    2 +-
 3 files changed, 7 insertions(+), 2 deletions(-)
---
diff --git a/NEWS b/NEWS
index 1a36c10..30f7cc6 100644
--- a/NEWS
+++ b/NEWS
@@ -6,7 +6,7 @@ Andreas:
        * Improve function import to ODF. [#750627]
        * Add CONFIDENCE.T, MODE.MULT, PERCENTILE.EXC, PERCENTRANK.EXC
          and QUARTILE.EXC.
-       * Fuzzed file fixes.  [#751060] [#751501]
+       * Fuzzed file fixes.  [#751060] [#751501] [#751907]
        * Fix ODF import of named expressions. [#750627]
        * Import reference unions from ODF. [#750627]
        * Improve CONVERT function.
diff --git a/plugins/openoffice/ChangeLog b/plugins/openoffice/ChangeLog
index e9de8b8..471362e 100644
--- a/plugins/openoffice/ChangeLog
+++ b/plugins/openoffice/ChangeLog
@@ -1,3 +1,8 @@
+2015-07-03  Andreas J. Guelzow <aguelzow pyrshep ca>
+
+       * openoffice-read.c (oo_add_text_to_cell): check whether the cell
+       has a value.
+
 2015-07-02  Andreas J. Guelzow <aguelzow pyrshep ca>
 
        * openoffice-read.c (od_series_reg_equation): Do not asssume that
diff --git a/plugins/openoffice/openoffice-read.c b/plugins/openoffice/openoffice-read.c
index 67b1c13..f1d36cf 100644
--- a/plugins/openoffice/openoffice-read.c
+++ b/plugins/openoffice/openoffice-read.c
@@ -4169,7 +4169,7 @@ oo_add_text_to_cell (OOParseState *state, char const *str, PangoAttrList *attrs)
        if (state->curr_cell == NULL)
                return;
 
-       if (VALUE_IS_STRING (state->curr_cell->value)) {
+       if ((NULL != state->curr_cell->value) && VALUE_IS_STRING (state->curr_cell->value)) {
                GOFormat *fmt = state->curr_cell->value->v_str.fmt;
                start = strlen (state->curr_cell->value->v_str.val->str);
                if (fmt != NULL)