Don't do
anything !
This is quite normal - especially if the bike has been left standing,
or if the Battery has been disconnected, or if the fuel level
has been altered, for example when filling the tank.
After filling the tank the delay in registering the correct level
is explained in the Owners Handbook on Page 34 :
After refuelling, the fuel gauge and range to empty
information will be updated only while riding the motorcycle.
Depending on the riding style, updating could take up to five minutes.
I frequently have no fuel bars indicated, especially after working on the bike,
but the correct fuel level is always indicated within a couple of minutes riding.

Cheers

