message: Set disassembly view to NULL when it's deleted
diff: @@ -202,6 +202,8 @@ void ShaderViewer::editShader(bool customShader, const QString &entryPoint, cons
  m_Scintillas.removeOne(m_DisassemblyView);
  ui->docking->removeToolWindow(m_DisassemblyFrame);
  + m_DisassemblyView = NULL;
  +
  // hide watch, constants, variables
  ui->watch->hide();
  ui->variables->hide();
  