[billreminder] Warn about import error for sqlalchemy module.

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

commit e67a687071674fc84b9c8458b476b5f988e099dd
Author: Og B. Maciel <ogmaciel gnome org>
Date:   Sat Nov 14 12:39:29 2009 -0500

    Warn about import error for sqlalchemy module.

 src/billreminder.py |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)
---
diff --git a/src/billreminder.py b/src/billreminder.py
index 78819dc..710f278 100644
--- a/src/billreminder.py
+++ b/src/billreminder.py
@@ -27,6 +27,12 @@ except ImportError:
     print "Please install gtk"
     raise SystemExit
 
+try:
+    import sqlalchemy
+except ImportError:
+    print "Please install sqlalchemy"
+    raise SystemExit
+
 from lib import dialogs
 from lib import common
 from lib import i18n