Spreadsheeteditor grab focus fix

[andrewzhivolup]

I'm calling the "grabFocus" method inside the editor - editor.grabFocus()

An error occurs when calling "grabFocus" in the spreadsheeteditor

this.getApplication().getController('DocumentHolder').getView().focus()

getView: function(t) {
    //this return undefined
    return this._ciewCache[t]
}

this.getApplication().getController('DocumentHolder').getView() is undefined

undefined.focus() is error

[CLAassistant]

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5 out of 6 committers have signed the CLA.

✅ JuliaRadzhabova
✅ svetlana81
✅ denisdokin
✅ Basher0303
✅ maxkadushkin
❌ Julia Radzhabova

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