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String and decimal results in case of error.



There was that in case of errors Item::val_str() and Item::val_decimal()
can return NULL (0) but I found some parts of the code do not allow it,
for example Item_sum_sum::add().

Should we revise val_* methods so that always retun something (for
example subquery EXISTS was changed (and even we have
subselect_debug.test about it), but single row subquery was not) or
change places where val_str() and val_decimal() that it will allow NULL (0).