fix: issue of corrupted PNG file.

Some corrupted PNG files will trigger error messages during parsing, but data is still read from them, and we process them following the normal procedure.
某些已损坏的PNG文件解析时会报错，但同时也读取到了数据，我们按正常流程处理。

Bug: https://pms.uniontech.com//bug-view-346475.html

Author: lichaofan2008

src/service/filehander.cpp

@@ -335,7 +335,14 @@ QImage loadImage_helper(const QString &path, FileHander *hander)
     }
 
     if (reader.canRead()) {
-        QImage img = reader.read();
+        QImage img;
+        qInfo() << "img can read, file:" << path;
+        // 某些已损坏的PNG文件这里会返回false，但同时也读取到了数据，我们按正常流程处理
+        if (reader.read(&img)) {
+            qInfo() << "img read success after can read, file:" << path;
+        } else {
+            qWarning() << "img read failed after can read, file:" << path;
+        }
         auto desktop = QApplication::desktop();
         if (Q_NULLPTR != desktop && img.logicalDpiX() != desktop->logicalDpiX()) {//图片Dpi值与屏幕会导致在图片上绘制位置错误
             img.setDotsPerMeterX(qRound(desktop->logicalDpiX() * 100 / 2.54));