netutils/webclient: check the request argument
netutils/webclient: check the request argument

Do an initial check on the argument of request in client_send_request
function to avoid possible segmentation faults.

Change-Id: If6ac47c9f974451de1942b85e181aa719b61d547
Signed-off-by: Jihun Ahn <31fe625dd60d1475d1b18ea57157c450e67c870a@samsung.com>

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