submodule: refuse to add repository with no commits

diff --git a/GIT-VERSION-GEN b/GIT-VERSION-GEN
index d1a2814ec7e415a525e58ac234df8184a2d0f93c..13f835f9cde4fd2e238db6c11bb2cf38a626a1b2 100755 (executable)
--- a/GIT-VERSION-GEN
+++ b/GIT-VERSION-GEN
@@ -1,7 +1,7 @@
 #!/bin/sh
 
 GVF=GIT-VERSION-FILE
-DEF_VER=v2.20.1
+DEF_VER=v2.21.0
 
 LF='
 '