Allow empty string as cvc config

Colvars / colvars

Collective variables library for molecular simulation and analysis programs

http://colvars.github.io/

GNU Lesser General Public License v3.0

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Closed jhenin closed 4 months ago

jhenin commented 4 months ago

Current error message was unclear (no valid cvc) Missing parameters will be caught individually. Useful for alchLambda cvc, which needs no config.

Fixes #394