Fix uploading evidence and autocomplete on observations

[ColonelThirtyTwo]

Reported by domwhewell on the Ghostwriter Slack channel

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 91.95%. Comparing base (a663368) to head (813b1b4).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #472 +/- ## ======================================= Coverage 91.95% 91.95% ======================================= Files 310 310 Lines 18102 18104 +2 ======================================= + Hits 16645 16647 +2 Misses 1457 1457 ```

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