should have texts fails with unclear message in case of "empty list" found by browser.all

[yashaka]

import { Browser, have, perform } from 'selenidejs';

let browser: Browser;

describe('TodoMVC', () => {

    beforeAll(async () => {
        browser = Browser.chrome();
        jasmine.DEFAULT_TIMEOUT_INTERVAL = 100000;
    });

    afterAll(async () => {
        await browser.quit();
    });

    it('completes task', async () => {

        await browser.open("http://todomvc.com/examples/emberjs/");

        await browser.element('//*[@id="new-todo"]').type('a').then(perform.pressEnter);
        await browser.element('//*[@id="new-todo"]').type('b').then(perform.pressEnter);
        await browser.element('//*[@id="new-todo"]').type('c').then(perform.pressEnter);
        await browser.all('//*[@id="new-todo"]//li').should(have.exactTexts('a', 'b', 'c'));
    });
});

fails with:

1) TodoMVC completes task
  Message:
    Error: 
    	Timed out after 4000ms, while waiting for:
    	browser.all(By(xpath, //*[@id="new-todo"]//li)).has exact texts a,b,c
    Reason:
    	Cannot read property 'includes' of undefined
  Stack:
    Error: 
    	Timed out after 4000ms, while waiting for:
    	browser.all(By(xpath, //*[@id="new-todo"]//li)).has exact texts a,b,c
    Reason:
    	Cannot read property 'includes' of undefined
        at <Jasmine>
        at processTicksAndRejections (internal/process/next_tick.js:81:5)

1 spec, 1 failure
Finished in 8.89 seconds

It should fail actually, because the //*[@id="new-todo"]//li selector is wrong (should be todo-list instead of new-todo), but the error is unclear...

maybe the reason is somewhere here: https://github.com/KnowledgeExpert/selenidejs/blob/master/lib/utils/predicates.ts#L25

the fix is needed:)

reproduced in branch: https://github.com/KnowledgeExpert/selenidejs/tree/new-not-syntax-for-conditions

[alex-popov-tech]

as far as I see, query.text returns empty array, which is fine, and I wasn't able to figure out how compare actually works, so please take this one @yashaka