AtmosphereRequest.toString() was broken and always returned resource().uuid().

Because of missing brackets, the ternary operator always evaluated to non null,
because it had a concatenated string on the left hand side. Thus it always
returned resource().uuid().
Merge pull request #1660 from CodingFabian/AtmosphereRequest-toString-fix

AtmosphereRequest.toString() was broken and always returned resource().uuid().