[noetic] Avoid infinite recursion in rosrun tab completion when rosba…

…sh is not installed (#1948)

* Avoid infinite recursion

This avoids infinite recusion that happens if tab completion is
attempted but rosbash is not installed.

Signed-off-by: Shane Loretz<sloretz@openrobotics.org>
Signed-off-by: Shane Loretz <sloretz@osrfoundation.org>

* remove empty line

Co-authored-by: Dirk Thomas <dirk-thomas@users.noreply.github.com>

tools/topic_tools/env-hooks/20.transform.bash

@@ -34,7 +34,7 @@ function _roscomplete_rosrun_transform
 {
     if is_transform_node; then
         _roscomplete_node_transform
-    else
+    elif [[ "$_sav_transform_roscomplete_rosrun" != "_roscomplete_rosrun_transform" ]]; then
         eval "$_sav_transform_roscomplete_rosrun"
     fi
 }