improved the condition in the FAST test

modules/features2d/test/test_fast.cpp

@@ -112,7 +112,8 @@ void CV_FastTest::run( int )
 
     // We only have testing data for 9_16 but it actually works equally well for 7_12
     if ((type==1) || (type==2)){
-    if ( 0 != norm(exp_kps1, kps1, NORM_L2) || 0 != norm(exp_kps2, kps2, NORM_L2))
+        if ( exp_kps1.size != kps1.size || 0 != norm(exp_kps1, kps1, NORM_L2) ||
+             exp_kps2.size != kps2.size || 0 != norm(exp_kps2, kps2, NORM_L2))
         {
             ts->set_failed_test_info(cvtest::TS::FAIL_MISMATCH);
             return;