Adrian Vovk
ffcf226c7f
Previously, sd-varlink was inconsistent about what it did with empty/missing/null parameters in a Varlink call or reply: when dispatching to a callback, it would always construct an empty object and hand over the empty object to the handler (good!). But when returning the value directly (i.e. with sd_varlink_call), it would return NULL when parameters were omitted and a JSON null when the paramerters were null. This inconsistency is a violation of UAPI.20, which states that receivers of Varlink messages MUST treat omitted/null/empty parameters on Varlink calls and replies equivalently, where senders only SHOULD prefer to omit the parameters. This commit makes sd-varlink normalize the parameters to an empty object whenever it is null or omitted, which brings sd-varlink into compliance with this rule in UAPI.20 (cherry picked from commit 34db99971e728e2c4f155c01d43d24f3fe313bef)
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