Fix for incorrect url resolution and single quotes for a string

[alexkuznetsov]

In this PR:

• Refactored url resolution for the grid;
• Replaced double quotes with single quotes for undefined string.

The problem is with the current method used to resolve urls in the data grid. AFAIK, in some cases url's are resolved more securely, but not all.

Minimal source code to understand the problem:

class MinExample {

    constructor(o) {
        this.url = o.url;
        Object.assign(this, o?.settings ||| {})
    }

    refresh() {
        let url = (typeof this.url != ‘object’ ? this.url : this.url.get);
        console.log(‘url’, url);
    }

}

In the refresh method, we resolve the url and just output it to the console. This is fine if the url is an object, string or whatever, but it breaks if the value of this.url is null. The error for a null value is as follows:

Uncaught TypeError: Cannot read properties of null (reading ‘get’)
    at x.refresh (<anonymous>:9:66)
    at <anonymous>:1:5

The fix also replaces double quotes for undefined:

let amount = typeof event.wheelDelta != "undefined" ? -event.wheelDelta : (event.detail || event.deltaY)

becomes

let amount = typeof event.wheelDelta != 'undefined' ? -event.wheelDelta : (event.detail || event.deltaY)

[alexkuznetsov]

@vitmalina should i create a new PR with rebuilded dist files?