Define a defaut command to remove need for _command_exists in theme

themes/barbuk/barbuk.theme.bash

@@ -74,9 +74,7 @@ function _exit-code {
 function _prompt {
     local exit_code="$?" wrap_char=' ' dir_color=$green ssh_info='' python_venv='' host command_duration=
 
-    if _command_exists _command_duration; then
-        command_duration=$(_command_duration)
-    fi
+    command_duration=$(_command_duration)
 
     _exit-code exit_code
     _git-uptream-remote-logo

themes/command_duration.theme.bash

@@ -1,6 +1,9 @@
 #!/usr/bin/env bash
 
 if [ -z "$BASH_IT_COMMAND_DURATION" ] || [ "$BASH_IT_COMMAND_DURATION" != true ]; then
+    _command_duration() {
+        echo -n
+    }
     return
 fi