[gnumeric] GUI: Make sure an empty string is shown with a quote.

[Morten Welinder <mortenw src gnome org>]

commit d7b0f0103746d21fd474eb88ddd13196dda3fdcc
Author: Morten Welinder <terra gnome org>
Date:   Wed Apr 21 11:53:12 2010 -0400

    GUI: Make sure an empty string is shown with a quote.

 ChangeLog  |    5 +++++
 NEWS       |    3 +++
 src/cell.c |    4 +++-
 3 files changed, 11 insertions(+), 1 deletions(-)
---
diff --git a/ChangeLog b/ChangeLog
index ecd63c6..2232509 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2010-04-21  Morten Welinder  <terra gnome org>
+
+	* src/cell.c (gnm_cell_get_entered_text): Make sure the empty
+	string gets quoted.  Fixes part of #616139.
+
 2010-04-21  Jean Brefort  <jean brefort normalesup org>
 
 	reviewed by: <delete if not using a buddy>
diff --git a/NEWS b/NEWS
index 99563de..0536ddf 100644
--- a/NEWS
+++ b/NEWS
@@ -6,6 +6,9 @@ Andreas:
 Jean
 	* Implement graph only sheets. [#158170]
 
+Morten:
+	* Make sure an empty string is shown with a quote.
+
 --------------------------------------------------------------------------
 Gnumeric 1.10.2
 
diff --git a/src/cell.c b/src/cell.c
index 9f2bc77..98923be 100644
--- a/src/cell.c
+++ b/src/cell.c
@@ -581,7 +581,9 @@ gnm_cell_get_entered_text (GnmCell const *cell)
 			/* Try to be reasonably smart about adding a leading quote */
 			char const *tmp = value_peek_string (v);
 
-			if (tmp[0] != '\'' && !gnm_expr_char_start_p (tmp)) {
+			if (tmp[0] != '\'' &&
+			    tmp[0] != 0 &&
+			    !gnm_expr_char_start_p (tmp)) {
 				GnmValue *val = format_match_number
 					(tmp,
 					 gnm_cell_get_format (cell),