Handle missing speech parameters better.
Handle missing speech parameters better.

svn path=/trunk/; revision=4567

chrys87/orca-beep,GNOME/orca,h4ck3rm1k3/orca-sonar,GNOME/orca,chrys87/orca-beep,pvagner/orca,h4ck3rm1k3/orca-sonar,GNOME/orca,h4ck3rm1k3/orca-sonar,pvagner/orca,GNOME/orca,pvagner/orca,chrys87/orca-beep,chrys87/orca-beep,pvagner/orca