do not create code if there is no gencode

Signed-off-by: Nico Schottelius <nico@kr.ethz.ch>

bin/cdist-object-gencode

@@ -44,6 +44,7 @@ export __global="$__cdist_out_dir"
 
 cd "$__cdist_local_base_dir"
 
+if [ -x "$gencode" ]; then
    cat << eof
 #
 # The following code is imported from output of $gencode
@@ -51,7 +52,6 @@ cat << eof
 
 eof
 
-if [ -x "$gencode" ]; then
    __cdist_exec_fail_on_error "$gencode"
 else
    if [ -f "$gencode" ]; then