AC: fix text detection adapter (#3658)

Author: eaidova

tools/accuracy_checker/openvino/tools/accuracy_checker/adapters/text_detection.py

@@ -154,8 +154,10 @@ def min_area_rect(contour):
         for bbox_idx in range(1, max_bbox_idx + 1):
             bbox_mask = (mask == bbox_idx).astype(np.uint8)
             cnts = cv2.findContours(bbox_mask, cv2.RETR_CCOMP, cv2.CHAIN_APPROX_SIMPLE)[-2]
-            if np.size(cnts) == 0:
+
+            if not cnts:
                 continue
+
             cnt = cnts[0]
             rect, rect_area = min_area_rect(cnt)