contours with zero area rejected

reject contours with zero area by using the "continue" statement to be in sync with the condition checking style used in the whole file

modules/features2d/src/blobdetector.cpp

@@ -239,13 +239,6 @@ void SimpleBlobDetector::findBlobs(const cv::Mat &image, const cv::Mat &binaryIm
             if (ratio < params.minConvexity || ratio >= params.maxConvexity)
                 continue;
         }
-
-        bool blob_valid = true;
-
-        if (moms.m00 == 0.0)
-        {
-            blob_valid = false;
-        }
         
         center.location = Point2d(moms.m10 / moms.m00, moms.m01 / moms.m00);
 
@@ -267,10 +260,10 @@ void SimpleBlobDetector::findBlobs(const cv::Mat &image, const cv::Mat &binaryIm
             center.radius = (dists[(dists.size() - 1) / 2] + dists[dists.size() / 2]) / 2.;
         }
 
-        if (blob_valid)
-        {
-            centers.push_back(center);
-        }
+        if(moms.m00 == 0.0)
+            continue;
+        centers.push_back(center);
+
 
 #ifdef DEBUG_BLOB_DETECTOR
         //    circle( keypointsImage, center.location, 1, Scalar(0,0,255), 1 );