patch 8.0.0265: may get ml_get error when :pydo deletes lines

Problem:    May get ml_get error when :pydo deletes lines or switches to
            another buffer. (Nikolai Pavlov, issue #1421)
Solution:   Check the buffer and line every time.
diff --git a/src/testdir/Make_all.mak b/src/testdir/Make_all.mak
index 12abb78..c01634c 100644
--- a/src/testdir/Make_all.mak
+++ b/src/testdir/Make_all.mak
@@ -176,6 +176,8 @@
 	    test_packadd.res \
 	    test_perl.res \
 	    test_profile.res \
+	    test_python2.res \
+	    test_python3.res \
 	    test_pyx2.res \
 	    test_pyx3.res \
 	    test_quickfix.res \