[REACT] change the error window when loading / synchronizing the gantt chart

[tikhonov.a.p]

This "const responseString = this.project.decode()" returned NULL

[alex.l]

Sorry for that, I gave you wrong code.
Of course, we need to pass responseText as a param of decode method.

Btw, I found that we didn't pass responseText into fail handlers, so you'll need to override 2 methods for our workaround. Here is an example:

const gantt = new Gantt({
    appendTo : 'container',
    

[...]

onCrudManagerRequestFail({ requestType, response, responseText }) {
    // response will be NULL here, so we will need to decode responseText again
    this.onCrudManagerRequestFinalize(false, requestType, responseText);
},

onCrudManagerRequestFinalize(successful, requestType, responseText){
    const response = this.project.decode(responseText);
    const me = this;

    if (successful) {
        me.masked = null;
        me.toggleEmptyText?.();
    }
    else {
        // Do not remove. Assertion strings for Localization sanity check.
        // 'L{GridBase.loadFailedMessage}'
        // 'L{GridBase.syncFailedMessage}'

        me.applyMaskError(`<div>SOMETHING</div>`);
    }
},