Fixes scalapack routines
Description
In some rare cases, the code can decide to have zero state on an MPI task. For instance 6 states for 4 MPI tasks.
In this case, the code was passing arrays the address of arrays of st_start to C routines where the arrays was allocated of size st_start:st_end, where st_end is 0.
The changes prevents the code to run into an array out-of-bound exception.
News snippet
Bugfix for scalapack
Checklist
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I have checked that my code follows the Octopus coding standards -
I have added tests for all the new features added in this request.