Squish: Fix tst_HELP04

Replace waiting for signal textChanged().

Change-Id: I010f65cb0b1130c2ba95921c5f128ca955a7ac69
Reviewed-by: Robert Loehning <robert.loehning@digia.com>
Squish: Fix tst_simple_analyze

The JavaScript tab is now disabled if there's no content at all.

Change-Id: I00e0a6adabd42d0783ad6833fe707323f5a69aae
Reviewed-by: Robert Loehning <robert.loehning@digia.com>