Fixed dead code.
While reviewing code I noticed some dead code. It was not possible to default to the channel variable because the parameter could not be both full and empty. If the parameter is not a non zero length string then the code looked like it was intending to default to the channel variable 'presence_data_cols'. If neither of these are the case it is a noop. By enabling the dead code, you now have access to set the 'presence_data_cols' in the dialplan or scripts like lua.
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