[BUG] docData Must Not Be Null Error in Findings Page

[jowg-amazon]

What is the bug?
If a detector generates a finding based on a document and its ID but then the document gets deleted, there is a docData must not be null error in the findings page and none of the findings appear.

How can one reproduce the bug?

1. Create a detector with a rule
2. Insert a document that generates a finding
3. Delete the document
4. Check the findings page

What is your host/environment?

• OS: 2.9

[riysaxen-amzn]

closing in favor of 1325