Hide Enable EIT EPG when IceTV is enabled

[prl]

Occasionally users enable MENU>Setup>TV>EPG settings>Enable EIT EPG when IceTV is enabled. This can cause inconsistencies in the EPG cache.

Enable EIT EPG should be hidden when IceTV is enabled.

[Peter Urbanec]

Fix issue #649: Hide Enable EIT EPG when IceTV is enabled

Only show setting MENU>Setup>TV>EPG settings>Enable EIT EPG if IceTV is disabled (or not installed).

Also prevent crashes in Screens/Setup.py if a non-existent config variable name is used in a setup.xml "requires" attribute (e.g. if it refers to a plugin setup variable). Print an error message to the debug log instead.

I originally thought this would be necessary to implement the test on config.plugins.icetv.enable_epg, but it is created even if the IceTV plugin is not installed.

→ <<cset f780aad1c5a8>>

[Peter Urbanec]

Merged in prl/easy-ui-4/Fix-issue-649 (pull request #449)

Fix issue #649: Hide Enable EIT EPG when IceTV is enabled

→ <<cset 9657534b4ea6>>