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Fix undefined behavior: calls front() on empty string

Jaswant Panchumarti (Kitware) requested to merge jaswant.panchumarti/vtk:fix-ub-in-ogl-batched-mapper into master
  • the scoped value rollback directly used front() with the new array name. If the array name string is empty, this is UB and segfaults with gcc-11 in debug builds.
Edited by Jaswant Panchumarti (Kitware)

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