R1:aad704d0fce5

Mark created Pholio mockups as new objects to fix empty Feed transaction entries

Summary:
When creating a Pholio mockup, `setIsCreateTransaction(true)` to avoid an empty `Transaction` field in the Feed and avoid `strncmp()` complaining about a null value being passed.

This is very similar to T15659 about Differential Diffs.

```
ERROR 8192: strncmp(): Passing null to parameter #1 ($string1) of type string is deprecated at [/var/www/html/phorge/phorge/src/applications/policy/query/PhabricatorPolicyQuery.