[billreminder] Make chart widget handle empty sets of data.

[Og B. Maciel <ogmaciel src gnome org>]

commit fcf43af70944b467b79c2c822ac6814b5a4508cf
Author: Og B. Maciel <ogmaciel gnome org>
Date:   Wed Nov 25 09:04:14 2009 -0500

    Make chart widget handle empty sets of data.

 src/gui/maindialog.py          |   22 ++++++++++++----------
 src/gui/widgets/chartwidget.py |    7 ++++++-
 2 files changed, 18 insertions(+), 11 deletions(-)
---
diff --git a/src/gui/maindialog.py b/src/gui/maindialog.py
index 076cf16..2fcea7d 100644
--- a/src/gui/maindialog.py
+++ b/src/gui/maindialog.py
@@ -304,16 +304,18 @@ class MainDialog:
         self.btnUnpaid.set_is_important(True)
 
     def _populate_chart(self, status, start, end):
-        chartdata = []
-        records = self.actions.get_monthly_totals(start, end)
-        #records = []
-        #for rec in records:
-        #    chartdata.append([field for field in rec])
-        #if chartdata:
-        print records
-        if records:
-            records = [(c,float(t)) for c,t in records]
-            self.chart.plot(records)
+
+        records = []
+
+        try:
+            records = self.actions.get_monthly_totals(start, end)
+            # Chart widget takes data in format (('CategoryName', amount),)
+            records = [(c if c else 'None',float(t)) for c,t in records]
+        except Exception, e:
+            print "%s - %s" % (records, str(e))
+            pass
+
+        self.chart.plot(records)
 
     def _populate_menubar(self):
         # Create a UIManager instance
diff --git a/src/gui/widgets/chartwidget.py b/src/gui/widgets/chartwidget.py
index d55a578..2505051 100644
--- a/src/gui/widgets/chartwidget.py
+++ b/src/gui/widgets/chartwidget.py
@@ -20,7 +20,12 @@ class ChartWidget(gtk.HBox):
         """
         Populates chart with data passed in.
         """
-        pass
+
+        # Clear the image widget if there is no data passed.
+        if not data:
+            self.chart.clear()
+            return
+
         surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, 400, 200)
 
         dataSet = (