Tools: Added check for validating input arguments in ardupilot-astyle.sh

Tools/CodeStyle/ardupilot-astyle.sh

@@ -1,4 +1,9 @@
-#!/bin/sh
+#!/usr/bin/env bash
+
+if [ -z "$1" ]; then
+    printf "\nArguments missing, Usage: '$0 <files to style>'\n\n"
+    exit 1
+fi
 
 if [ $(uname) = "Darwin" ]; then
     DIR=$(dirname $(greadlink -f $0))
@@ -7,4 +12,3 @@ else
 fi
 
 astyle --options="${DIR}"/astylerc $*
-