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Fix ex53.c: avoid computing plane rotations for zero rows/columns

Fernando Alvarruiz requested to merge fernan-fix-ex53 into main

ex53.c can compute plane rotations in cases where the two involved rows/columns are all zeroes. This causes a failure on macOS with scalar=real:

BLAS error: Parameter number 4 passed to cblas_drot had an invalid value

Avoid computing the plane rotations in those cases.

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