Description:
The file crashes when copying the selected document fragment not from the beginning of the line with the transition to the next paragraph, if was open the "Accessibility check" tab.

It looks like the problem is in lines like this:
SwWrtShell* pWrtShell = rDocument.GetDocShell()->GetWrtShell();

In the problematic case, rDocument.GetDocShell() returns nullptr, which causes the program to crash when calling GetWrtShell(). Perhaps the code needs an additional check for nullptr, as is done here, a little lower:

SwDocShell* pShell = pDoc->GetDocShell();
  if (!pShell)
    return;

Steps to Reproduce:
1. Open the file.odt or .docx
2. Open the "Accessibility check" tab
3. Select several paragraphs of the text, starting not from the beginning of the line
4. Try to copy the selected text

Actual Results:
The file is crashing

Expected Results:
The text is being copied


Reproducible: Always


User Profile Reset: No

Additional Info:
Previously, we wrote in the related PR: Bug tdf#162889, but decided to create a new one, because there is no promotion.

First repro on master:
Version: 25.2.0.0.alpha0+ (X86_64) / LibreOffice Community
Build ID: 245a20b6093237fc247f9515e37dc70556448812
CPU threads: 12; OS: Linux 6.6; UI render: default; VCL: gtk3
Locale: ru-RU (ru_RU.UTF-8); UI: en-US
Calc: CL threaded