Dashboard Pane: `label` crashes when the subject is not a NamedNode

[timbl]

Console log

Uncaught (in promise) TypeError: subject.site is not a function
    at Object.label (mashlib.js:62753)
    at mashlib.js:65309
    at Array.filter (<anonymous>)
    at _callee6$ (mashlib.js:65308)
    at tryCatch (mashlib.js:120589)
    at Generator.invoke [as _invoke] (mashlib.js:120815)
    at Generator.prototype.<computed> [as next] (mashlib.js:120641)
    at asyncGeneratorStep (mashlib.js:64629)
    at _next (mashlib.js:64651)
    at mashlib.js:64658

eg when subject is https://webschemas.org/SpecialAnnouncement

in the code:

  name: 'dashboard',
  label: function label(subject) {
    if (subject.uri === subject.site().uri) {
      return 'Dashboard';
    }

[timbl]

eg you expand the URI field in internals pan, then the subject is a literal? In principle could be blane node I guess too.