fb_helper: check explicitly for not None

bump protobuf version

Merge pull request #420 from agri-gaia/fix/queryAllLabel

fix query for multiple labels at once

add isStatic for tf to fb_helper

Revert "WIP: query for multiple time intervals at once"

This reverts commit ad6ead9.

add logging settings

Merge pull request #411 from agri-gaia/example/cppTfQuery

add cpp example for tf query

Merge pull request #396 from agri-gaia/feat/defer-fb-point-index-crea…

…tion

Defer index creation when storing points using the flatbuffers service

Merge pull request #394 from agri-gaia/upgradeTwine

upgrade twine to resolve KeyError: 'license'

Merge pull request #390 from agri-gaia/doc/updatePublications

Doc/update publications