added quiet closing method in new streamutils class, used to clean up the connectdialog

Mage.Common/src/main/java/mage/utils/StreamUtils.java

@@ -0,0 +1,21 @@
+package mage.utils;
+
+import java.io.Closeable;
+
+public final class StreamUtils {
+
+    /***
+     * Quietly closes the closable, ignoring nulls and exceptions
+     * @param c - the closable to be closed
+     */
+    public static void closeQuietly(Closeable c) {
+        if (c != null) {
+            try {
+                c.close();
+            }
+            catch (Exception e) {
+            }
+        }
+    }
+
+}