459273 - Redundant license notices

+ Only showing license acknowledgement request screen
  if [FILES] section contains content that does not (yet) exist

jetty-start/src/main/java/org/eclipse/jetty/start/Main.java

@@ -407,7 +407,7 @@ public class Main
 
         if (!args.isApproveAllLicenses())
         {
-            if (!module.acknowledgeLicense())
+            if (!module.hasFiles(baseHome) && !module.acknowledgeLicense())
             {
                 StartLog.warn(EXITING_LICENSE_NOT_ACKNOWLEDGED);
                 System.exit(1);

jetty-start/src/main/java/org/eclipse/jetty/start/Module.java

@@ -279,7 +279,7 @@ public class Module
         {
             return true;
         }
-
+        
         System.err.printf("%nModule %s:%n",getName());
         System.err.printf(" + contains software not provided by the Eclipse Foundation!%n");
         System.err.printf(" + contains software not covered by the Eclipse Public License!%n");
@@ -361,6 +361,20 @@ public class Module
         return enabled;
     }
 
+    public boolean hasFiles(BaseHome baseHome)
+    {
+        for (String ref : getFiles())
+        {
+            FileArg farg = new FileArg(this,ref);
+            Path refPath = baseHome.getBasePath(farg.location);
+            if (!Files.exists(refPath))
+            {
+                return false;
+            }
+        }
+        return true;
+    }
+
     public void process(BaseHome basehome) throws FileNotFoundException, IOException
     {
         Pattern section = Pattern.compile("\\s*\\[([^]]*)\\]\\s*");
@@ -477,5 +491,4 @@ public class Module
         str.append(']');
         return str.toString();
     }
-
 }