This patch (again, to be applied on top of the current set of 
metadirective patches) fixes two minor issues with metadirectives in the 
Fortran front-end.

- 'sorry' is called if a declarative OpenMP directive is found in a 
metadirective clause.
- An ICE that occurs with an empty metadirective (i.e. just '!$omp 
metadirective' with nothing else) is fixed.

Thanks

Kwok