Charging system warning, vent tubes missing.

Had my dash light up with check charging system warning triangle and other lights. This prompted me to inspect the battery cells. 27 of the cells are well over 7.8V and only one is 7.74 so I assume these are all good. The buss connections were starting to grow corrosion so I polished all of them and gave them all a smear of dielectric silicone. If the light comes on again I plan on taking it in for service but in the mean time I'm curious why someone may have deleted the two vent tubes that are supposed to link to the fan vent for each cell. I have a replacement now but figured I'd ask before I put it back together. Is there a good reason not to have the tubes or is the fact that it's missing promoting corrosion at the buss terminals? Or even leading to temp problems potentially?