patch 9.0.0142: crash when adding and removing virtual text

Problem:    Crash when adding and removing virtual text. (Ben Jackson)
Solution:   Check that the text of the text property still exists.
diff --git a/src/version.c b/src/version.c
index b6c3699..c0b2aa0 100644
--- a/src/version.c
+++ b/src/version.c
@@ -736,6 +736,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    142,
+/**/
     141,
 /**/
     140,