tmuxinator completion update:

Current completion plugin isn't up to date and #2075 PR, which is also
the completion plugin on the official tmuxinator repository, doesn't
work. Thus this should do the trick for the moment.
Also suppressed an error when no completion is available

plugins/tmuxinator/_tmuxinator

@@ -11,10 +11,12 @@ _arguments -C \
 case $state in
   cmds)
     _values "tmuxinator command" \
+        "new[create a new project file and open it in your editor]" \
         "start[start a tmux session using project's tmuxinator config]" \
         "open[create a new project file and open it in your editor]" \
         "copy[copy source_project project file to a new project called new_project]" \
         "delete[deletes the project called project_name]" \
+        "debug[output the shell commands generated by a projet]" \
         "implode[deletes all existing projects!]" \
         "list[list all existing projects]" \
         "doctor[look for problems in your configuration]" \
@@ -24,9 +26,9 @@ case $state in
     ;;
   args)
     case $line[1] in
-      start|open|copy|delete)
+      start|open|copy|delete|debug)
         _configs=(`find ~/.tmuxinator -name \*.yml | cut -d/ -f5 | sed s:.yml::g`)
-        _values 'configs' $_configs
+        [[ -n "$_configs" ]] && _values 'configs' $_configs
         ret=0
         ;;
     esac