ds-identify: do not write None twice to datasource_list.

If the only the None datasource was listed in datasource_list, then
ds-identify would write a cloud.cfg witih:
 datasource_list: [None, None]

The fix is to just append None if the list only has None.

1 files changed, 3 insertions, 1 deletions

diff --git a/tools/ds-identify b/tools/ds-identify
index 30106347..54bd9999 100755
--- a/tools/ds-identify
+++ b/tools/ds-identify
@@ -954,7 +954,9 @@ found() {
         shift
     fi
     # always write the None datasource last.
-    list="${list:+${list}, }None"
+    if [ "$list" != "None" ]; then
+        list="${list:+${list}, }None"
+    fi
     write_result "datasource_list: [ $list ]" "$@"
     return
 }