samvera / questioning_authority / 710

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fix exception when some context URIs have additional data and some don’t

Changes:
* all context values are arrays even if there is only one value
* context values that are URIs attempt to fetch additional context in the form…
```
{
  "uri":"http://id.loc.gov/authorities/genreForms/gf2014026836",
  "id":"http://id.loc.gov/authorities/genreForms/gf2014026836",
  "label":"Glitch music"
}
```
If none of the URIs have at least label for a context field, then only the URIs are returned.  If a mix of URI values with extended context and some with only the URI, then the ones with only URIs will be in the form…
```
{
  "uri":"http://id.loc.gov/authorities/genreForms/gf2017026022",
  "id”:null,
  "label":""
}
```

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