Previously, if none of the values supplied for the pltitles, tltemplates, clcategories, or imimages parameters to prop=links, prop=templates, prop=categories, or prop=images were valid titles, the parameter would be ignored and all links, templates, categories, or images would be returned. With the merge of Gerrit change 347879,[1] this situation will result in no links, templates, categories, or images being returned, as none match the invalid titles supplied. Note that submitting an empty value for one of these parameters will continue to ignore the parameter and return all links, templates, categories, or images, since this seems to be relatively common practice. [1]: https://gerrit.wikimedia.org/r/#/c/347879/ -- Brad Jorsch (Anomie) Senior Software Engineer Wikimedia Foundation