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(stable) Fix repository URI generation for SVN commit identifiers represented…

Description

(stable) Fix repository URI generation for SVN commit identifiers represented with integer types

Summary:
Ref T13588. See PHI2198. Some pathways represent SVN commit identifiers (which are numeric) with integers; these raise an exception in phutil_nonempty_string(), which is strict.

(Ideally, commit identifiers wouldn't have mixed types, but that's a dramatically less practical change.)

Test Plan: Will deploy.

Maniphest Tasks: T13588

Differential Revision: https://secure.phabricator.com/D21852