Unsupported `genericblock` causes supported `generichide` to be ignored

[okiehsch]

Describe the issue

uBlock does not enforce a filter with a generichide rule, if it is accompanied by a
genericblock rule, probably because it doesn't support genericblock.
This effects some rules in Easylistgermany, for example.
@@||spiegel.de^$genericblock,generichide
@@||tellows.de^$genericblock,generichide

Steps for anyone to reproduce the issue

1. Add @@||github.com^$generichide to your filter list

2. Go to github.com

3. Logger as expected
   

4. If you add @@||github.com^$genericblock,generichide instead
   

Your settings

• Browser/version: Chrome 55
• uBlock Origin version: 1.10.4

Your filter lists

default

[lewisje]

I guess the genericblock option should be ignored rather than causing the whole filter to be rejected: #967 (comment)