Query Editor js error on AEM 6.5.10

[pebcakerror]

AEM 6.5.10

Query Editor throws js/angular error when 'Run Query' button is clicked.

ReferenceError: _ is not defined angularjs.js:92 
    at params (clientlibs.js:97)
    at k.$scope.query (clientlibs.js:108)
    at angularjs.js:177
    at angularjs.js:194
    at k.$eval (angularjs.js:112)
    at k.$apply (angularjs.js:112)
    at HTMLButtonElement.<anonymous> (angularjs.js:194)
    at HTMLButtonElement.dispatch (jquery.js:5232)
    at HTMLButtonElement.elemData.handle (jquery.js:4884)

[ncautotest]

a quick fix is provided in #239 (comment) but ideally it would be cleaner to get rid of the underscore dependency; the usages that I've found seem to be limited to _.each()