fix(sdcm/tester.py): Fix test stoppage on shard reporting failure
fix(sdcm/tester.py): Fix test stoppage on shard reporting failure

This fixes an issue where an exception occuring in argus client during
shard reporting would propagate to the events system and fail the test.

scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests