Fix pareview

Resolve the errors
Git errors:

There is still a master branch, make sure to set the correct default branch: https://www.drupal.org/node/1659588 → . Then remove the master branch, see also step 6 and 7 in https://www.drupal.org/node/1127732 →

Review of the 7.x-2.x branch (commit 21bc75e):

DrupalPractice has found some issues with your code, but could be false positives.

FILE: /var/www/drupal-7-pareview/pareview_temp/field_redirection.module
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FOUND 0 ERRORS AND 1 WARNING AFFECTING 1 LINE
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403 | WARNING | Variable $hook_boot_headers is undefined.
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