Empty schema.org accessibility metadata not flagged as error

[SarahMagdalena]

Please provide the following details if possible or relevant:

• [1.0.2] the version of Ace impacted by the issue (as returned by the ace -v command).

Currently, missing schema.org accessibility metadata (e.g. accessMode etc.) are indicated as an error, while empty metadata (e.g. <meta property="schema:accessMode"></meta>) are not.
Is it possible to extend the rule to missing and/or empty metadata to make sure there is at least one description for every metadata property? Or is there a case, where empty schema.org accessibility metadata properties make sense?

[laudrain]

See also Issue 202