GET categor(y/ies): Fix JSON results #117
Merged
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A preliminary workaround that fixes the invalid JSON results reported in #115. Now the behaviour is at least consistent with the corresponding GET methods for entries and ratings by always returning a JSON array. This is not an incompatible API change, because the affected function was completely unusable.
The RESTful API design issues still need to be fixed by splitting the use cases for looking up a single entity vs. searching multiple entities into separate functions.