'juju status' triggers overly verbose DEBUG error

If you do:
  juju status 0/lxd/0
you end up with this in the debug log:
[LOG] 0:01.889 DEBUG juju.apiserver.client ignoring matching error: pattern "0/lxd/0" contains too many '/' characters
[LOG] 0:01.890 DEBUG juju.apiserver.client ignoring matching error: pattern "0/lxd/0" contains too many '/' characters
[LOG] 0:01.892 DEBUG juju.apiserver.client ignoring matching error: pattern "0/lxd/0" contains too many '/' characters
[LOG] 0:01.894 DEBUG juju.apiserver.client ignoring matching error: pattern "0/lxd/0" contains too many '/' characters
[LOG] 0:01.897 DEBUG juju.apiserver.client ignoring matching error: pattern "0/lxd/0" contains too many '/' characters
[LOG] 0:01.901 DEBUG juju.apiserver.client ignoring matching error: pattern "0/lxd/0" contains too many '/' characters

This seems to be because of:
func NewUnitMatcher(patterns []string) (unitMatcher, error) {
    pattCopy := make([]string, len(patterns))
    for i, pattern := range patterns {
        pattCopy[i] = patterns[i]
        fields := strings.Split(pattern, "/")
        if len(fields) > 2 {
            return unitMatcher{}, fmt.Errorf("pattern %q contains too many '/' characters", pattern)
        }

Which, it is perfectly true that '0/lxd/0' isn't a Unit declaration, but that shouldn't be an 'ignoring matching error'. We should be treating it as 'this isn't a request for a unit, so we aren't matching on units'. *Maybe* that would still be a DEBUG message, but it should be clearer that it isn't just 'ignoring ... error'.