vtkXMLTreeReader: protect against possible nullptr dereference
Vulnerability reported at https://nvd.nist.gov/vuln/detail/CVE-2021-42521.
Backport of !9586 (merged)
Backport: paraview/release
Vulnerability reported at https://nvd.nist.gov/vuln/detail/CVE-2021-42521.
Backport of !9586 (merged)
Backport: paraview/release