fix: Spamming debug logs while resizing

The session id of Screen object might not be initialized when resized.

Issue: linuxdeepin/developer-center#6296
Log: Spamming debug logs while resizing
Signed-off-by: Yutao Meng <mengyutao@deepin.org>

3rdparty/terminalwidget/lib/Screen.cpp

@@ -98,6 +98,7 @@ Screen::Screen(int l, int c)
  , _lastPos(-1)
  , _lastDrawnChar(0)
  , _escapeSequenceUrlExtractor(new EscapeSequenceUrlExtractor)
+ , _sessionId(0)
 
 {
  _escapeSequenceUrlExtractor->setScreen(this);
@@ -380,7 +381,7 @@ void Screen::resizeImage(int new_lines, int new_columns)
  if (_currentTerminalDisplay) {
  // The 'zsh' works different from other shells when writting the command line.
  // It needs to identify the 'zsh' and calculate the new command line.
- auto currSession = SessionManager::instance()->idToSession(_sessionId);
+ auto currSession = _sessionId > 0 ? SessionManager::instance()->idToSession(_sessionId) : nullptr;
  if (currSession
  && (QLatin1String("zsh") == currSession->foregroundProcessName())
  && (cursorLine > 0)