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[Mahara Bot <1557896@xxxxxxxxxxxxxxxxxx>]

Patch for "master" branch: https://reviews.mahara.org/6146

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https://bugs.launchpad.net/bugs/1557896

Title:
  Javascript warnings from select2, on tagged blog entries block

Status in Mahara:
  In Progress
Status in Mahara 15.10 series:
  In Progress
Status in Mahara 16.04 series:
  In Progress

Bug description:
  When you click into the select2 on the tagged blog entries block, but
  haven't typed anything in yet, Select2 prints a Javascript warning to
  the JS console.

  This is because, in this case, select2 requests taggedposts.json.php
  without the "q" param that represents a query string. And
  taggedposts.json.php tries to retrieve the value of q using
  "param_variable()" without a default value, which means that q is
  required to be present. When it's not, the script errors out and
  returns a JSON object with an error message. This is different from
  what Select2 expects, and Select2 doesn't try to check for it at all,
  so it throws a warning when it tries to access a field in the object
  which is not present.

  Since this is standard Select2 behavior, we should make it return a
  non-error value when "q" is empty.

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