Test flake: Catalog numbers should be stripped from leading and trailing spaces

[php-coder]

Catalog numbers should be stripped from leading and trailing space... | FAIL |
You may only interact with visible elements
Build info: version: '2.53.1', revision: 'a36b8b1cd5757287168e54b817830adce9b0158d', time: '2016-06-30 19:26:09'
System info: host: 'testing-gce-c3470a5d-ec27-4249-8db1-41efb69e148d', ip: '127.0.1.1', os.name: 'Linux', os.arch: 'amd64', os.version: '4.4.0-93-generic', java.version: '1.8.0_144'

A full log: https://travis-ci.org/php-coder/mystamps/jobs/282930665

Introduced in e19185f (#530)

[php-coder]

More failures: https://travis-ci.org/php-coder/mystamps/jobs/287060786 and
https://travis-ci.org/php-coder/mystamps/jobs/287060787

[php-coder]

Another one: https://travis-ci.org/php-coder/mystamps/jobs/317833814