Merge "gtbs: Fix for crash when uri is not set"

        ByteArrayOutputStream stream = new ByteArrayOutputStream();

        for (Map.Entry<Integer, TbsCall> entry : callsList.entrySet()) {

            TbsCall call = entry.getValue();

            int listItemLength = Math.min(listItemLengthMax, 3 + call.getUri().getBytes().length);

            if (call == null) {

                Log.w(TAG, "setBearerListCurrentCalls: call is null");

                continue;

            }

            int uri_len = 0;

            if (call.getUri() != null) {

                uri_len =  call.getUri().getBytes().length;

            }

            int listItemLength = Math.min(listItemLengthMax, 3 + uri_len);

            stream.write((byte) (listItemLength & 0xff));

            stream.write((byte) (entry.getKey() & 0xff));

            stream.write((byte) (call.getState() & 0xff));

            stream.write((byte) (call.getFlags() & 0xff));

            if (uri_len > 0) {

                stream.write(call.getUri().getBytes(), 0, listItemLength - 3);

            }

        }

        return mBearerListCurrentCallsCharacteristic.setValue(stream.toByteArray());

    }