[1.7.x] Removed erroneous trailing comma in OLMapWidget.js.

Backport of c5226eb72a from master
[1.7.x] Updated current state of MySQL Connector/Python.

Backport of 7be646425f from master
[1.7.x] Fixed #22681 -- Made TarArchive recognize leading directories properly.

Backport of 083d285b82 from master