Complete command names even if ValidArgs present (#1088)

Signed-off-by: Marc Khouzam <marc.khouzam@montreal.ca>

bash_completions.go

@@ -181,10 +181,9 @@ __%[1]s_handle_reply()
     local completions
     completions=("${commands[@]}")
     if [[ ${#must_have_one_noun[@]} -ne 0 ]]; then
-        completions=("${must_have_one_noun[@]}")
+        completions+=("${must_have_one_noun[@]}")
     elif [[ -n "${has_completion_function}" ]]; then
         # if a go completion function is provided, defer to that function
-        completions=()
         __%[1]s_handle_go_custom_completion
     fi
     if [[ ${#must_have_one_flag[@]} -ne 0 ]]; then