updated for version 7.3.645
Problem:    No tests for patch 7.3.625 and 7.3.637.
Solution:   Add more tests for the "gn" command and try/catch. (Christian
            Brabandt)
diff --git a/src/testdir/test53.ok b/src/testdir/test53.ok
index 4f1e5a6..928caff 100644
--- a/src/testdir/test53.ok
+++ b/src/testdir/test53.ok
@@ -21,4 +21,7 @@
 SEARCH:
 searchmatch
 abcdx |  | abcdx
+join lines
+zerowidth pattern
+elete first and last char
 end: