Added proper handling of rollback in plot tool. Before, an null exception was simply printed. Now, a test has been added in rollback of plot tool to ensure that exception is not provoked.
Added proper handling of rollback in plot tool. Before, an null
exception was simply printed. Now, a test has been added in rollback of
plot tool to ensure that exception is not provoked.

Signed-off-by: Jakob Brandsborg Ehmsen <387ed33cc9ebf98b733caa2520baacd616b28aa5@gmail.com>
jakobehmsen/dynamake