patch 9.0.0167: checking for text properties could be a bit more efficient

Problem:    Checking for text properties could be a bit more efficient.
Solution:   Return early when there are no text properties.  Update TODO
            items.
diff --git a/src/version.c b/src/version.c
index 7544d6f..4bab4a5 100644
--- a/src/version.c
+++ b/src/version.c
@@ -736,6 +736,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    167,
+/**/
     166,
 /**/
     165,