So, there is basicly two simillar bugs.1st is utterly gamebraking which is force you to dodge is that you have LITERALLY EMPTY CHAMPION POOL,so you can't pick anything and being forced to dodge.But luckily, occuring rarely.
2nd one,in the other hand,Happens every single time when i trying to play 1st game after my PC reboot.I having only default rune pages
I just had these two bugs happened at the same pick.But luckily it was a custom game so i didn't lost anything off that
Here's the example how this bug looks like
This is how my actual champion pool and rune pages looks like
And these bugs "lives" for a very long time, like half year already. I do really hope that riots will fix that somewhen, because this is really annoying to be forced to dodge or not being able to choose runes you want
P.S. Sry for any grammar mistakes i might have, my english is not that good :(