修复了刚才bug的bug

modified:   sub_windows/sub_window_6.py
	modified:   sub_windows/sub_window_7.py
	modified:   sub_windows/sub_window_8.py

sub_windows/sub_window_6.py

@@ -26,7 +26,7 @@ class SubWindow(QMainWindow):
             QFileDialog(), "选择图片", "", "图像文件(*.jpg *.bmp *.png)"
         )
         self.cv_srcImage = cv2.imread(file_path)
-        if self.cv_srcImage is None:
+        if self.cv_srcImage is not None:
             height, width = self.cv_srcImage.shape[0], self.cv_srcImage.shape[1]
             ui_image = QImage(
                 cv2.cvtColor(self.cv_srcImage, cv2.COLOR_BGR2RGB),

sub_windows/sub_window_7.py

@@ -23,7 +23,7 @@ class SubWindow(QMainWindow):
             QFileDialog(), "选择图片", "", "图像文件(*.jpg *.bmp *.png)"
         )
         self.cv_srcImage = cv2.imread(file_path)
-        if self.cv_srcImage is None:
+        if self.cv_srcImage is not None:
             height, width = self.cv_srcImage.shape[0], self.cv_srcImage.shape[1]
             ui_image = QImage(
                 cv2.cvtColor(self.cv_srcImage, cv2.COLOR_BGR2RGB),

sub_windows/sub_window_8.py

@@ -27,7 +27,7 @@ class SubWindow(QMainWindow):
             QFileDialog(), "选择图片", "", "图像文件(*.jpg *.bmp *.png)"
         )
         self.cv_srcImage = cv2.imread(file_path)
-        if self.cv_srcImage is None:
+        if self.cv_srcImage is not None:
             gray = cv2.cvtColor(self.cv_srcImage, cv2.COLOR_BGR2GRAY)
             faces = self.face_cascade.detectMultiScale(
                 gray, scaleFactor=1.15, minNeighbors=5, minSize=(5, 5)