looks like the completeness check for cached data is only half baked

[robstoll]

Describe the bug
I don't have a concrete scenario but looking at the code, we see the following three comments at the end of isCachedDataComplete

//validate operator into
//validate artist info
//validate wikipedia summary

So it sound like we might have the case that the cached data does not have all data and using the cached data could thus result in a view of a fountain which is incomplete (e.g. the artist is not shown -- we have encountered this for the Sardona fountain at some point, could have been the reason) . I don't know whether this is intentional or not