Cannot set fk to int64 when returning the model from a helper proc
When I define the foreign key as int64 and want to write a helper proc that will return the model/object, I'll get the following error. That's because in sqlites rowutils the `to` template does not handle int64 types. I can compile everything successfully when i comment out my helper proc or change the foreign key type to int.
```
normtest.nim(46, 1) template/generic instantiation of `withDb` from here
normtest.nim(49, 24) template/generic instantiation of `getOne` from here
.nimble/pkgs/norm-1.0.17/norm/sqlite.nim(137, 15) template/generic instantiation of `getOne` from here
.nimble/pkgs/norm-1.0.17/norm/sqlite.nim(132, 17) template/generic instantiation of `to` from here
.nimble/pkgs/norm-1.0.17/norm/sqlite/rowutils.nim(129, 9) Error: unreachable statement after 'return' statement or '{.noReturn.}' proc
```