Don't pass uninitialised memory around (plus removing some commented out code).
Don't pass uninitialised memory around (plus removing some commented out code).

This will hopefully fix the test failures associated with r14765.  Note that it does not deal with the other underlying coding issues with that commit as discussed on amcg-dev but I'm committing this superficial fix to allow people to run with intel debugging again.

FluidityProject/multifluids,FluidityProject/multifluids,FluidityProject/multifluids,FluidityProject/multifluids