Fix no-compare-relation-boolean error when passing <2 args

[dwickern]

My editor runs eslint on every change to the source file. When I type assert.strictEqual(, the editor autofills the closing paren. Then eslint crashes on the no-compare-relation-boolean rule with the error:

TypeError: Cannot read properties of undefined (reading 'type')

[platinumazure]

Tests look good. I think the logic is incorrect and causing failing tests at the moment so I left a note where I think the change needs to be, but let me know if I'm wrong.

[platinumazure]

Thanks for this! We definitely want to avoid a crash if at all possible.

[coveralls]

Coverage remained the same at 100.0% when pulling b024a13 on dwickern:fix-no-compare-relation-boolean into 23fa36d on platinumazure:master.

[platinumazure]

Looks good, thanks!