libtracker-data: Fixes NB#174591, Throw error on undefined variable in expressions
libtracker-data: Fixes NB#174591, Throw error on undefined variable in expressions

hoheinzollern/tracker,hoheinzollern/tracker,hoheinzollern/tracker,outofbits/tracker,outofbits/tracker,hoheinzollern/tracker,outofbits/tracker,outofbits/tracker,hoheinzollern/tracker,hoheinzollern/tracker,outofbits/tracker,outofbits/tracker,hoheinzollern/tracker,outofbits/tracker