Not a big deal as Qatari Riyal is not "free market currency" like others.
For banks Qatari Riyal is some kind of exotic currency and if somebody was dealing the reason was only to make business smooth for good number of local customers (London great example) but when this crisis came is no wonder banks stopped as Q.Riyal has no real value and currency can sink by xx% in a day without warning
In continental Europe I can not recall any bank dealing with Riyal even before crisis. Also my bank ask me deal with dollars and offered VIP exchange rate to do business directly in QAR instead.
So not a big surprise.
I can see bigger problem what happen in few hours after 10 day deadline as Saudi apparently preparing some more sanctions for Qatar.