Don't NPE if properties param isn't set; allow overriding torrent behavior for testing

src/java/com/threerings/getdown/data/Application.java

@@ -439,7 +439,8 @@ public class Application
         }
 
         // determine whether or not we should be using bit torrent
-        _useTorrent = (cdata.get("torrent") != null);
+        _useTorrent = (cdata.get("torrent") != null) ||
+            (System.getProperty("torrent") != null);
 
         // look for a debug.txt file which causes us to run in java.exe on
         // Windows so that we can obtain a thread dump of the running JVM

src/java/com/threerings/getdown/launcher/GetdownApplet.java

@@ -99,13 +99,16 @@ public class GetdownApplet extends JApplet
         }
 
         // Pass through properties parameter.
-        String[] properties = getParameter("properties").split(" ");
-        for (String property : properties) {
+        String properties = getParameter("properties");
+        if (properties != null) {
+            String[] proparray = properties.split(" ");
+            for (String property : proparray) {
                 String key = property.substring(property.indexOf("-D") + 2,
                     property.indexOf("="));
                 String value = property.substring(property.indexOf("=") + 1);
                 System.setProperty(key, value);
             }
+        }
 
         // when run from an applet, we install 
         String root;