gap-system / gap / 11912

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travis-ci

kernel: change ViewObjHandler to use GAP_TRY

This means that now if the `ViewObj` method we call raises an error that
we catch, we won't increment `STATE(NrError)` anymore. But this makes no
difference as there are just two places that call `ViewObjHandler`:

1. `READ_TEST_OR_LOOP`: calls `ClearError` at the start of each loop
   iteration and before exiting, so the change does not matter.

2. `Shell`: calls `ClearError` at the start of each loop iteration;
   and in the code path which calls `ViewObjHandler`, we do not leave
   the loop and are guaranteed to start a new loop iteration, which
   then clears `NrError`.

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