Verdy_p
You're wrong, this is not just a white spot, and the zipzag pattern on the way (both sides) is very visible and can only mean there's a bus stop there and  shelter is also clearly visible. Don't know which lines use this stop, probably a departmental bus line, but note that city bus transports in Niort (TAN) have been recently completely changed in september 2017 (all lines renumbered with digits instead of letters, fewer lines, less frequent services, longer lines, but no fee to pay).
There's also on-demand buses that may use this stop location. It may be used for school buses only.