[bisq-network/bisq] Accept empty config values (#3978)

[Christoph Atteneder]

Fixes #3977.
You can view, comment on, or merge this pull request online at:

  https://github.com/bisq-network/bisq/pull/3978

-- Commit Summary --

  * Accept empty config values

-- File Changes --

    M common/src/main/java/bisq/common/config/ConfigFileOption.java (2)
    M common/src/test/java/bisq/common/config/ConfigFileOptionTests.java (9)

-- Patch Links --

https://github.com/bisq-network/bisq/pull/3978.patch
https://github.com/bisq-network/bisq/pull/3978.diff

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