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Patch for "16.04_STABLE" branch: https://reviews.mahara.org/6410

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https://bugs.launchpad.net/bugs/1571910

Title:
  Missing cacheversion on upgrade gives errors

Status in Mahara:
  In Progress
Status in Mahara 16.04 series:
  In Progress
Status in Mahara 16.10 series:
  Fix Committed

Bug description:
  When upgrading from old version that doesn't have cacheversion set we
  get this error

  [WAR] 21 (lib/htmlpurifier/HTMLPurifier/Config.php:901) Value for
  HTML.DefinitionRev is of invalid type, should be int invoked on line
  3598 in file /home/robertl/htdocs/mahara-
  devel/mahara/htdocs/lib/web.php

  It doesn't stop the upgrade from progressing, so I'll mark this bug as
  low priority, but could freak user out when upgrading their sites.

  It would be good to allow get_config() function to take a $default
  value option, similar to how param_alpha() works.

  This way we can set a default value before the upgrade sets the
  correct value

  So I'm thinking get_config('cacheversion', 0); would return value '0'
  rather than false so that htmlpurifier does not complain but still
  allows for the upgrade to set the cacheversion as expected.

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