parser: don't crash when parsing <weight> tags

When encountering a <weight> tag, we would parse into the last
weightsystem. However, we only create weightsystems when
encountering <weightsystem> tag. Therefore, this code would
either crash or overwrite the previous weightsystem.

Instead, create a new weightsystem for each <weight> tag.

Moreover, make sure that inside a <weightsystem> tag a
weightsystem actually exists. This should be the case,
but who knows...?

Reported-by: Nihal Gabr <gabr.nihal@gmail.com>
Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>

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