Minor null fix

Author: HydrolienF

src/main/java/fr/formiko/utils/FLUFiles.java

@@ -99,7 +99,7 @@ public static boolean downloadAndUnzip(String url, String destination, String di
 
     public static boolean openWebLinkInBrowser(String url) { return false; }
 
-    public static String toStandardPath(String path) { return path.replace('\\', '/'); }
+    public static String toStandardPath(String path) { return path == null ? null : path.replace('\\', '/'); }
 
     // Internal class to hide implementation
     private static class FLUFilesInternal {