#27 invalid row displayed when viewing empty list

[rbll]

If viewing an empty list after viewing a non-empty list
on the same page the row tag will display one invalid
row (leftover from the previous view) which is visible
when using the column tag's body.

This can be fixed by ensuring that the bean attribute
is removed from page context if there are no more
values in the valuelist in DefaultRowTag.java. See
attached diff

[rbll]

DefaultRowTag.java 0.1.7 diff