fix wiki api failure if extract is empty but still present #13893
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closes #13877
If the extract given by Wikibooks is an empty string, but is still there, it currently throws that api error due to
lila/ui/analyse/src/wiki.ts
Lines 61 to 62 in a2f76a9
Need to check that it is not empty first, so that it doesn't show an api error in this case
I chose to just show nothing as if the opening doesn't exist (because it doesn't in Wikibooks)