Adding a consent to a user waiting to be part of a family causes an exception in the UI

Description

If a child is waiting to be confirmed as part of a family, and you add a consent to them, you end up with an exception in the admin console.

Steps to reproduce

Create a consent, make sure it has email plus enabled. I just used the default email templates.
Create an application
Create a parent account:
```
API_KEY=...
```

curl -H 'Content-type: application/json' -H "Authorization: $API_KEY" 'http://localhost:9011/api/user/registration/' -d '{"registration": {"applicationId": "85a03867-dccf-4882-adde-1a79aeec50df" }, "user" : { "birthDate": "1980-01-01", "email" : "parent1withcoppa@example.com", "password": "pass" }}'


* Create a child account associated with a parent account.

API_KEY=...

curl -H 'Content-type: application/json' -H "Authorization: $API_KEY" 'http://localhost:9011/api/user/registration/' -d '{"registration": {"applicationId": "85a03867-dccf-4882-adde-1a79aeec50df"}, "user" : { "parentEmail" : "parent1withcoppa@example.com", "birthDate": "2019-01-01", "email" : "kid8withcoppa@example.com", "password": "pass" }}'


* If you view the kid account now in the admin screen, things are fine.
* Add the consent to the kids account (with the parent as the giver):

CONSENT_ID=20b8814a-fdd8-4724-aa30-908c7bde3212

curl -XPOST -H 'Content-type: application/json' -H "Authorization: $API_KEY" 'http://localhost:9011/api/user/consent' -d '{"userConsent": {"giverUserId" : "9258faf9-3bd1-428a-9007-b0798bef0512", "userId": "9def3223-9f0a-49cc-865e-d7ae840a1070", "consentId": "'$CONSENT_ID'" }}'


* Now if you view the kid's user details page, you see an error message on the `consent` tab and all the tabs after it don't render.

Here's the error message (full stack trace attached):

FreeMarker template error (DEBUG mode; use RETHROW in production!): The following has evaluated to null or missing: ==> users(userConsent.giverUserId) [in template "WEB-INF/templates/admin/user/_macros.ftl" at line 599, column 30] ---- Tip: If the failing expression is known to legally refer to something that's sometimes null or missing, either specify a default value like myOptionalVar!myDefault, or use [#if myOptionalVar??]when-present[#else]when-missing[/#if]. (These only cover the last step of the expression; to cover the whole expression, use parenthesis: (myOptionalVar.foo)!myDefault, (myOptionalVar.foo)?? ---- ---- FTL stack trace ("~" means nesting-related): - Failed at: #assign giver = users(userConsent.giv... [in template "WEB-INF/templates/admin/user/_macros.ftl" in macro "consentTable" at line 599, column 13] - Reached through: @userMacros.consentTable [in template "WEB-INF/templates/admin/user/manage.ftl" at line 123, column 11] ~ Reached through: #nested [in template "WEB-INF/templates/_utils/panel.ftl" in macro "full" at line 15, column 9] ~ Reached through: @panel.full panelClass="panel ${panel... [in template "WEB-INF/templates/admin/user/manage.ftl" at line 88, column 7] ~ Reached through: #nested [in template "WEB-INF/templates/_layouts/admin.ftl" in macro "main" at line 317, column 5] ~ Reached through: @layout.main [in template "WEB-INF/templates/admin/user/manage.ftl" at line 74, column 5] ~ Reached through: #nested [in template "WEB-INF/templates/_layouts/admin.ftl" in macro "body" at line 297, column 5] ~ Reached through: @layout.body [in template "WEB-INF/templates/admin/user/manage.ftl" at line 30, column 3] ~ Reached through: #nested [in template "WEB-INF/templates/_layouts/admin.ftl" in macro "html" at line 13, column 3] ~ Reached through: @layout.html [in template "WEB-INF/templates/admin/user/manage.ftl" at line 21, column 1] ---- Java stack trace (for programmers): ---- freemarker.core.InvalidReferenceException: [... Exception message was already printed; see it above ...] at freemarker.core.InvalidReferenceException.getInstance(InvalidReferenceException.java:134) at ...



[stacktrace.txt from screen](https://github.com/FusionAuth/fusionauth-issues/files/4860275/stacktrace.txt)

[stacktrace2.txt from logs](https://github.com/FusionAuth/fusionauth-issues/files/4860292/stacktrace2.txt)

### Expected behavior

No stack trace displayed, can see consents.

### Screenshots

<img width="1527" alt="Screen Shot 2020-07-01 at 2 23 15 PM" src="https://user-images.githubusercontent.com/91825/86287982-6dd71980-bba6-11ea-8b6a-da864990ac41.png">

### Platform

FusionAuth 1.17.4 and 1.17.0
Firefox

### Additional context

I see the following error in the console: `Error: A div is required with the following ID [sessions]` when I load the kid details page.

If a child is part of a family, you see this bug instead: https://github.com/FusionAuth/fusionauth-issues/issues/718

FusionAuth / fusionauth-issues