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Fix an exception in cursor pagination of Conpherence threads

Description

Fix an exception in cursor pagination of Conpherence threads

Summary: Ref T13680. Conpherence may pass values with an integer type to this layer of the stack. These are "supposed" to be strings, but just be accepting.

Test Plan:

  • Wrote 100+ messages to a Conpherence room.
  • Clicked "Show Older Messages".
  • Before: exception, int passed to "phutil_nonempty_string()".
  • After: older messages loaded.

Maniphest Tasks: T13680

Differential Revision: https://secure.phabricator.com/D21824