Make the error check independent of PHP's serialize() function implementation as per #1284364-21: Use variable_initialize() against broken values - Notice: unserialize() [function.unserialize]:
Modified the report UI a little bit, so as to avoid confusion about required permissions (Closes #1421648: Does not show)
Allow users to delete invalid variables as per #1165566 by mgifford.
Do not print an empty variable and do properly initialise variables, so as to avoid PHP notices.
Backport to Drupal 6.x
First release of this module.