Ok, so say i want to dodge with my weapon OB, but i have dropped my weapon. Do I get any DB bonus?
YES!! You always dodge!!! (apply Qu total bonus as DB)
[That is unless you are somehow pinned to the ground (by a spell, mud or tar puddle, whatever!!) There are exceptions for everything in a fantasy game
]
Well, we have always understood that (with no armor nor others bonus/malus/special skills or items):
1) You always dodge!!! (apply Qu total bonus as DB)
2) You hold a weapon? You may parry with it! (trade as many OB to DB as you want) [and if you trade the 100% of your OB to DB (aka Full Parry) you add and extra +5DB for "weapon shielding" (02-04 Shield-Parry Table)]
3) You don't have weapon but hold something solid enough (a stool, a cape wrapped around your forearm, a log, a bow,...) or have something you can put in between (a table, small tree, low wall, streetlight,...) then, at GM's discretion, you can add some DB.
And you must add all three together to have your total DB = 1)+2)+3).
As an anecdote, there are medieval drawings of duels that had a low wall/fence in between duelist. They even didn't don leg armor, it was unnecessary!!