patch 8.2.0101: crash when passing null object to ":echomsg"

Problem:    Crash when passing null object to ":echomsg".
Solution:   Check for NULL pointer. (Yasuhiro Matsumoto, closes #5460)

src/version.c

@@ -742,6 +742,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    101,
 /**/
     100,
 /**/