Merge #7851: [qa] pull-tester: Don't mute zmq ImportError
fae1f4e [qa] rpc-tests: Fix link in comment and label error msg (MarcoFalke)
faa4f22 [qa] pull-tester: Exit early when no tests are run (MarcoFalke)
fa05e22 [qa] pull-tester: Don't mute zmq ImportError (MarcoFalke)