[FIX] follow-up: output error when missing field set in pluginList sort control
As commented by @bsfez here, my solution worked as long as the field started with tracker_field_ because I relied on his example on the task from https://dev.tiki.org/item7761. However, when the field name does not start with tracker_field_, my solution has no effect. this has just been resolved in this commit.
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Edited by Domeshow Emmanuel