POLISH: it can now quit when it wasn't able to connect to DB

pyfpdb/fpdb.pyw

@@ -845,6 +845,7 @@ class fpdb:
         print "Quitting normally"
         # TODO: check if current settings differ from profile, if so offer to save or abort
         
+        if self.db!=None:
             if self.db.backend==self.db.MYSQL_INNODB:
                 try:
                     if self.db is not None and self.db.connected:
@@ -854,6 +855,8 @@ class fpdb:
             else:
                 if self.db is not None and self.db.connected:
                     self.db.disconnect()
+        else:
+            pass
         self.statusIcon.set_visible(False)
 
         self.window.destroy() # explicitly destroy to allow child windows to close cleanly