Protect next() calls wit try/except inside generators

Protect next() calls wit try/except inside generators

This fixes a DeepSource alert:

Unguarded next inside generator

Calls to `next()` should be inside `try-except` block.

When the iterator is exhausted, `StopIteration` exception is raised. When
used inside a generator, this can cause unexpected behavior. If not
handled, it will propagate out of the generator causing termination.
PEP-479 has been accepted to fix this problem. It will modify the
behavior of `StopIteration` in generators.

Each call to `next()` should be wrapped in a `try-except` block to explicitly
handle `StopIteration` exceptions.

Signed-off-by: Dimitri Papadopoulos <3350651-DimitriPapadopoulos@users.noreply.gitlab.com>
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