[M34-Merge] Browser silently exits in some cases.

[M34-Merge] Browser silently exits in some cases.

When a view is created using ewk_view_add_with_session_data and both data and
length values passed equal 0, function returns NULL which causes browser
to exit silently on application start.
This patch fixes the bug by adding a fallback which creates a view but
without taking into account session data.

Original patch: http://165.213.202.130:8080/#/c/70731/

Reviewed by: Antonio Gomes, Balazs Kelemen
Bug: http://107.108.218.239/bugzilla/show_bug.cgi?id=8530
Change-Id: I9a835cc5c29ddd70f0c8745f6e0427fb991577a7
Signed-off-by: Michał Pakuła vel Rutka <m.pakula@samsung.com>