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Fix an error when fn===undefined (#3580)

* Fix an error when fn===undefined

This change fixes an error that occurs when reporter is 'xunit' and run is called without callback: " /rbd/pnpm-volume/a49b9a7c-c3f0-42ba-ae66-612ead86e96c/node_modules/.registry.npmjs.org/mocha/5.2.0/node_modules/mocha/lib/reporters/xunit.js:126
 fn(failures);  ^
TypeError: fn is not a function "

* Add test `.reporter("xunit").run(fn)`

This test has `try catch` block to catch an error if it occurs and write it to the console.

* formatting

* Update mocha.spec.js

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