Bug 474863: don't report download speed as 0 if no data available

if no download speed data is available (yet), do not report
download "0B at 0 B/s". This may happen for smaller files
that are downloaded faster than the speed resolution of 1 second.
However display total file size info if available.

Change-Id: I4f4e530230c74985de36a1fd8ea053106adde64f
Signed-off-by: Jan Sievers <jan.sievers@sap.com>
3 files changed