Fix error when database has no stations (fixes #440)

openmeteo / enhydris

A database with a web interface for the storage and management of hydro/meteorological measurements and time series

GNU Affero General Public License v3.0

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Closed aptiko closed 3 years ago

aptiko commented 3 years ago

Checklist:

[ ] All tests are passing
[ ] I have added any necessary documentation and/or release notes
[ ] I have followed the commit message guidelines and the "before submitting a pull request" guidelines
[ ] If I introduced (or abolished) any third-party library, I will write a short paragraph in this PR according to the guidelines
[ ] I have removed all obsoleted code