patch 8.2.1848: crash when passing a NULL string or list to popup_settext()

Problem:    Crashyyyyy passing a NULL string or list to popup_settext().
Solution:   Check for NULL pointers. (closes #7132)
diff --git a/src/version.c b/src/version.c
index b95e0e9..b0fe5e8 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1848,
+/**/
     1847,
 /**/
     1846,