Report header goes missing of timezone info is not available.

[jobinau]

When we analyze partial data collection on a continuous data gathering. parameter values are not collected each time because that adds unwanted overhead.
But this will result in an unwanted consequence: the header data goes missing because it joins with the parameter value.

[jobinau]

This has been addressed in https://github.com/jobinau/pg_gather/commit/61aa456bebaa29f2742aa51f1e4c38dc46d9ce99