Merge pull request #15966 from saskatchewancatch:issue-15760

Add checks for empty operands in Matrix expressions that don't check properly

* Starting to add checks for empty operands in Matrix expressions that
don't check properly.

* Adding checks and delcarations for checker functions

* Fix signatures and add checks for each class of Matrix Expr operation

* Make it catch the right exception

* Don't expose helper functions to public API

modules/calib3d/test/test_undistort_badarg.cpp

@@ -270,7 +270,7 @@ void CV_UndistortPointsBadArgTest::run(int)
     cvReleaseMat(&temp);
 
     src_points = cv::Mat();
-    errcount += run_test_case( CV_StsAssert, "Input data matrix is not continuous" );
+    errcount += run_test_case( CV_StsBadArg, "Input data matrix is not continuous" );
     src_points = cv::cvarrToMat(&_src_points_orig);
     cvReleaseMat(&temp);