OSA: Only try to copy file if if exists

When the file sync is executed against stable branches
the file in the files_to_sync may not exist. This patch
ensures that the file exists before trying to copy it.

Change-Id: I31e195b0df4cf13dd449d48b41ae26a21a4bb1b6

jenkins/scripts/sync_openstack_ansible_common_files.sh

@@ -41,6 +41,12 @@ check_and_ignore() {
 }
 
 for x in ${files_to_sync[@]}; do
+    # If the source repo does not have the file to copy
+    # then skip to the next file. This covers the situation
+    # where this script runs against old branches which
+    # do not have the same set of files.
+    [[ ! -e ${x} ]] && continue
+
     # If the target repo does not have such a file already
     # then it's probably best to leave it alone.
     [[ ! -e ${OSA_PROJECT}/${x} ]] && continue