(*)Avoid uninitialized data use in find_interfaces #1493
Merged
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Modified find_interfaces to avoid using uninitialized data when there is no
input data in a column or only one layer of data and linear interpolation is
nonsensical. This could change the initial conditions in some layer-mode cases,
but in practice all solutions in the MOM6-examples test suite are bitwise
identical, even though temporarily inserted error messages reveal that the
conditions that triggered the modified code are being encountered.