CVS scott: Handle windows without class/resource name

[FVWM CVS]

CVSROOT:        /home/cvs/fvwm
Module name:    fvwm
Changes by:     scott   05/11/09 07:00:00

Modified files:
        modules/FvwmTabs: Tag: 3.6 FvwmTabs.in 

Log message:
Handle windows without class/resource name