Fixes a failure to initiate outgoing calls.

src/net/java/sip/communicator/service/protocol/media/CallPeerMediaHandler.java

@@ -1020,6 +1020,13 @@ public MediaStream getStream(MediaType mediaType)
         {
         case AUDIO:
             return audioStream;
+        case DATA:
+            /*
+             * DATA is a valid MediaType value and CallPeerMediaHandler does not
+             * utilize it at this time so no IllegalArgumentException is thrown
+             * and null is returned (as documented).
+             */
+            return null;
         case VIDEO:
             return videoStream;
         default: