[probe] Only target scope.weave.works implicitly if no app is provided
[probe] Only target scope.weave.works implicitly if no app is provided

kinvolk/scope,weaveworks/scope,weaveworks/scope,dilgerma/scope,weaveworks/scope,kinvolk/scope,alban/scope,kinvolk/scope,alban/scope,alban/scope,weaveworks/scope,weaveworks/scope,kinvolk/scope,dilgerma/scope,paulbellamy/scope,dilgerma/scope,kinvolk/scope,dilgerma/scope,dilgerma/scope,paulbellamy/scope,kinvolk/scope,dilgerma/scope,paulbellamy/scope,paulbellamy/scope,alban/scope,alban/scope,alban/scope,paulbellamy/scope,weaveworks/scope,paulbellamy/scope