Crash with poorly given var

[liviuchircu]

Although core variables correctly handle this error, OpenSIPS will segfault when a module variable is given instead:

startup_route
{
    #works, throws error
    $ru(foo) = "foo";

    #crashes
    $T_fr_timeout(foo) = 5;
...

line 9: 5074 Segmentation fault (core dumped) ./opensips -m 64 -M 64 -w . -f ...