Change Details

Although this an exceptional condition and it's not supposed to happen unless there's a problem with the software (for example unversioned requests made against a revision-stabilized page), the standard for MediaWiki APIs is to treat the parameter like a failed filter and return an empty result set. Currently the API returns the requested key with a `null` value. Make sure that consumers can handle the new response.

Although this an exceptional condition and it's not supposed to happen unless there's a problem with the software (for example unversioned requests made against a revision-stabilized page), the standard for MediaWiki APIs is to treat the parameter like a failed filter and return an empty result set. Currently the API returns the requested key with a `null` value. [Example of a such a bogus query](https://en.wikipedia.org/w/api.php?action=query&prop=mapdata&titles=Downton_Abbey&mpdgroups=_ca5fe2a1449687fe54ae1fdbde7b637cd662d3b7!) vs. [how it's supposed to look like](https://en.wikipedia.org/w/api.php?action=query&prop=mapdata&titles=Downton_Abbey&mpdgroups=_ca5fe2a1449687fe54ae1fdbde7b637cd662d3b7). ```lang=JSON, counterexample "mapdata": [ "{\"_ca5fe2a1449687fe54ae1fdbde7b637cd662d3b7\":null}" ] ``` ```lang=JSON, name=Suggestion #1 "mapdata": [] ``` ```lang=JSON, name=Suggestion #2 "mapdata": [ "{\"_ca5fe2a1449687fe54ae1fdbde7b637cd662d3b7\":[]}" ] ``` Make sure that consumers can handle the new response.

Although this an exceptional condition and it's not supposed to happen unless there's a problem with the software (for example unversioned requests made against a revision-stabilized page), the standard for MediaWiki APIs is to treat the parameter like a failed filter and return an empty result set. Currently the API returns the requested key with a `null` value. [Example of a such a bogus query](https://en.wikipedia.org/w/api.php?action=query&prop=mapdata&titles=Downton_Abbey&mpdgroups=_ca5fe2a1449687fe54ae1fdbde7b637cd662d3b7!) vs. [how it's supposed to look like](https://en.wikipedia.org/w/api.php?action=query&prop=mapdata&titles=Downton_Abbey&mpdgroups=_ca5fe2a1449687fe54ae1fdbde7b637cd662d3b7). ```lang=JSON, counterexample "mapdata": [ "{\"_ca5fe2a1449687fe54ae1fdbde7b637cd662d3b7\":null}" ] ``` ```lang=JSON, name=Suggestion #1 "mapdata": [] ``` ```lang=JSON, name=Suggestion #2 "mapdata": [ "{\"_ca5fe2a1449687fe54ae1fdbde7b637cd662d3b7\":[]}" ] ``` Make sure that consumers can handle the new response.