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Fix #600
See also https://mobilitydata-io.slack.com/archives/CNXA9ASBV/p1715598631556219
What is the proposal?
Specify that strings (including IDs) MUST NOT be empty.
Is this a breaking change?
Which files are affected by this change?
All of them (because of the IDs)
Examples of affected feeds
https://mobilitydata-io.slack.com/archives/CNXA9ASBV/p1708449123435399?thread_ts=1708429919.754579&cid=CNXA9ASBV